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Is there equivalent C# function for "mysqli_fetch_array"?

So I want to manually convert the PHP function to C# Windows Form but I don't know the equivalent function mysqli_fetch_array in C# and how to do array PHP in C#?
I've googling but there is no correct solution.
This is in C# Windows Form
openConnection();
string selectQuery = "SELECT * FROM data_pegawai WHERE is_deleted=0 AND username='" + user + "'";
MySqlCommand command = new MySqlCommand(selectQuery, conn);
MySqlDataReader reader = command.ExecuteReader();
while (valuesList = reader.Read())
{
id = reader.GetInt32("id_peg");
}
closeConnection();
kembali = bayar - subtotal;
lblKembali.Text = kembali.ToString();
string insertQuery1 = "UPDATE data_transaksi SET status_pengerjaan='Lunas',potongan_harga='" + diskonrupiah.ToString() + "',subtotal='" + txtSubtotal.Text + "' WHERE id_transaksi =" + int.Parse(txtID_T.Text);
string insertQuery2 = "INSERT INTO pegawai_onduty VALUES(NULL, '" + id + "','" + txtID_T.Text + "')";
openConnection();
string selectQuery1 = "SELECT dsp.id_spareparts, dtsp.JUMLAH_SPAREPART from data_transaksi dt LEFT JOIN detail_transaksi_sparepart dtsp ON dt.id_transaksi=dtsp.id_transaksi LEFT JOIN spareparts_motor sm ON dtsp.ID_SPAREPARTMOTOR=sm.ID_SPAREPARTMOTOR LEFT JOIN data_spareparts dsp ON sm.id_spareparts=dsp.id_spareparts where dtsp.id_transaksi =" + int.Parse(txtID_T.Text);
MySqlCommand command1 = new MySqlCommand(selectQuery1, conn);
MySqlDataReader reader1 = command1.ExecuteReader();
while (reader1.Read())
{
int getData = "SELECT jumlah_stok FROM data_spareparts dsp WHERE id_spareparts='$jml[0]'";
}
closeConnection();
runQuery(insertQuery1);
runQuery(insertQuery2);
loadTransaksi();
And this is PHP code that I trying to convert to
while($jml=mysqli_fetch_array($dataJumlah))
{
$getData = mysqli_query($conn, "SELECT jumlah_stok FROM data_spareparts dsp WHERE id_spareparts='$jml[0]' ") or die (mysqli_error($conn));
$dataSP = mysqli_fetch_array($getData);
$idSpareparts = $dataSP[0];
$jmlStok = (int) $dataSP[0];
$jmlJual = (int) $jml[1];
$sisaStok = $jmlStok-$jmlJual;
$updateStok = mysqli_query($conn,"UPDATE data_spareparts SET jumlah_stok=$sisaStok WHERE id_spareparts='$jml[0]'") or die (mysqli_error($conn));
}
So I want to do "while($jml=mysqli_fetch_array($dataJumlah))" in C# and the rest of it. But how?

This question has been answered.
Below is the answer
subtotal = Convert.ToDouble(txtSubtotal.Text);
bayar = Convert.ToDouble(txtBayar.Text);
if (bayar < subtotal)
{
MessageBox.Show("Nominal yang dibayarkan lebih kecil dari Subtotal!");
}
else
{
openConnection();
string selectQuery = "SELECT * FROM data_pegawai WHERE is_deleted=0 AND username='" + user + "'";
MySqlCommand command1 = new MySqlCommand(selectQuery, conn);
MySqlDataReader reader1 = command1.ExecuteReader();
while (reader1.Read())
{
id = reader1.GetInt32("id_peg");
}
closeConnection();
kembali = bayar - subtotal;
lblKembali.Text = kembali.ToString();
string insertQuery1 = "UPDATE data_transaksi SET status_pengerjaan='Lunas',potongan_harga='" + diskonrupiah.ToString() + "',subtotal='" + txtSubtotal.Text + "' WHERE id_transaksi =" + int.Parse(txtID_T.Text);
string insertQuery2 = "INSERT INTO pegawai_onduty VALUES(NULL, '" + id + "','" + txtID_T.Text + "')";
openConnection();
string selectQuery1 = "SELECT dsp.id_spareparts, dtsp.JUMLAH_SPAREPART from data_transaksi dt LEFT JOIN detail_transaksi_sparepart dtsp ON dt.id_transaksi=dtsp.id_transaksi LEFT JOIN spareparts_motor sm ON dtsp.ID_SPAREPARTMOTOR=sm.ID_SPAREPARTMOTOR LEFT JOIN data_spareparts dsp ON sm.id_spareparts=dsp.id_spareparts where dtsp.id_transaksi =" + int.Parse(txtID_T.Text);
MySqlCommand command2 = new MySqlCommand(selectQuery1, conn);
MySqlDataReader reader2 = command2.ExecuteReader();
while (reader2.Read())
{
idSparepart = reader2.GetString(0);
jmlJual = reader2.GetInt32(1);
}
closeConnection();
openConnection();
string getData = "SELECT jumlah_stok FROM data_spareparts dsp WHERE id_spareparts='" + idSparepart + "'";
MySqlCommand command3 = new MySqlCommand(getData, conn);
MySqlDataReader reader3 = command3.ExecuteReader();
while (reader3.Read())
{
jmlStok = reader3.GetInt32(0);
}
closeConnection();
sisastok = jmlStok - jmlJual;
string updateStok = "UPDATE data_spareparts SET jumlah_stok = '" + sisastok + "' WHERE id_spareparts ='" + idSparepart + "'";
try
{
openConnection();
MySqlCommand command4 = new MySqlCommand(updateStok, conn);
if (command4.ExecuteNonQuery() == 1)
{
MessageBox.Show("Data berhasil disimpan!");
}
else
{
MessageBox.Show("Data tidak berhasil disimpan!");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
closeConnection();
}
runQuery(insertQuery1);
runQuery(insertQuery2);
loadTransaksi();
}

No mapping exists from object type

private void button5_Click(object sender, EventArgs e)
{
DataGridViewRow updatedrow = dataGridView1.Rows[chooseAnyRow];
updatedrow.Cells[0].Value = SALUTATION.Text;
updatedrow.Cells[1].Value = NAME.Text;
updatedrow.Cells[2].Value = SEX.Text;
updatedrow.Cells[3].Value = ETHNICITY.Text;
updatedrow.Cells[4].Value = MARITALSTATUS.Text;
updatedrow.Cells[5].Value = ICNUMBER.Text;
updatedrow.Cells[6].Value = HPNUMBER.Text;
updatedrow.Cells[7].Value = DOB.Text;
updatedrow.Cells[8].Value = ADDRESS.Text;
updatedrow.Cells[9].Value = STATE.Text;
updatedrow.Cells[10].Value = CITY.Text;
updatedrow.Cells[11].Value = POSTCODE.Text;
updatedrow.Cells[12].Value = pictureBox1.Image;
con = new SqlConnection(#"Data Source=dasranrajlui\sqlexpress;Initial Catalog=SESoriginal;Integrated Security=True");
con.Open();
com = con.CreateCommand();
com.CommandType = CommandType.Text;
com.CommandText = " update VoterRegistration set SALUTATION = '" + SALUTATION.Text +
"', NAME = '" + NAME.Text +
"', SEX = '" + SEX.Text +
"', ETHNICITY = '" + ETHNICITY.Text +
"', MARITALSTATUS = '" + MARITALSTATUS.Text +
"', IC_NUMBER = " + ICNUMBER.Text +
", HP_NUMBER = " + HPNUMBER.Text +
", DOB = '" + DOB.Text +
"', ADDRESS = '" + ADDRESS.Text +
"', STATE = '" + STATE.Text +
"', CITY = '" + CITY.Text +
"', POSTCODE = '" + POSTCODE.Text +
"', VOTER_PIC = #VOTER_PIC where IC_NUMBER = " + ICNUMBER.Text;
com.CommandType = CommandType.Text;
com.Parameters.AddWithValue("#VOTER_PIC", pictureBox1.Image);
com.Parameters.AddWithValue("#Salutation", SALUTATION.Text);
com.Parameters.AddWithValue("#Name", NAME.Text);
com.Parameters.AddWithValue("#Sex", SEX.Text);
com.Parameters.AddWithValue("#Ethnicity", ETHNICITY.Text);
com.Parameters.AddWithValue("#MaritalStatus", MARITALSTATUS.Text);
com.Parameters.AddWithValue("#ICNumber", ICNUMBER.Text);
com.Parameters.AddWithValue("#HPNumber", HPNUMBER.Text);
com.Parameters.AddWithValue("#Dob", DOB.Text);
com.Parameters.AddWithValue("#Address", ADDRESS.Text);
com.Parameters.AddWithValue("#State", STATE.Text);
com.Parameters.AddWithValue("#City", CITY.Text);
com.Parameters.AddWithValue("#PostCode", POSTCODE.Text);
if (pictureBox1.Image != null)
{
ms = new MemoryStream();
pictureBox1.Image.Save(ms, ImageFormat.Jpeg);
byte[] photo_aray = new byte[ms.Length];
ms.Position = 0;
ms.Read(photo_aray, 0, photo_aray.Length);
com.Parameters.AddWithValue("#VOTER_PIC", photo_aray);
}
try
{
com.ExecuteNonQuery();
MessageBox.Show("updated...");
SALUTATION.Text = null;
NAME.Text = null;
SEX.Text = null;
ETHNICITY.Text = null;
MARITALSTATUS.Text = null;
ICNUMBER.Text = null;
HPNUMBER.Text = null;
DOB.Text = null;
ADDRESS.Text = null;
STATE.Text = null;
CITY.Text = null;
POSTCODE.Text = null;
}
catch (Exception EX)
{
MessageBox.Show(EX + "NOT Updated");
}
finally
{
con.Close();
}
}
The error shows:
no mapping exists from object type
Is it because my convert image is wrong?
Or is there another way to update the image to my sql?
The thing is I need to update my values in the image which I can display and update which can save to my database.

Few more mistakes in your code; Corrected form is below
You are using the parameterized queries in wrong way. you need to use #parameterName instead for passing the corresponding value. your query will opens a wide door for sql Injection.
The , after POSTCODE =.. causing the current error, You need not to place , after the last column name`.
Finally you need to add com.Parameters.AddWithValue("#ICNumber",
ICNUMBER.Text); two times since the command expecting 12 parameters
Code will be like the following:
com.CommandText = " update VoterRegistration set SALUTATION =#Salutation" +
", NAME = #Name" +
", SEX = #Sex" +
", ETHNICITY = #Ethnicity" +
", MARITALSTATUS = #MaritalStatus" +
", IC_NUMBER = #ICNumber" +
", HP_NUMBER = #HPNumber" +
", DOB = #Dob" +
", ADDRESS = #Address" +
", STATE = #State" +
", CITY = #City" +
", POSTCODE = #PostCode where IC_NUMBER =#ICNumber";
com.CommandType = CommandType.Text;
com.Parameters.AddWithValue("#Salutation", SALUTATION.Text);
com.Parameters.AddWithValue("#Name", NAME.Text);
com.Parameters.AddWithValue("#Sex", SEX.Text);
com.Parameters.AddWithValue("#Ethnicity", ETHNICITY.Text);
com.Parameters.AddWithValue("#MaritalStatus", MARITALSTATUS.Text);
com.Parameters.AddWithValue("#ICNumber", ICNUMBER.Text);
com.Parameters.AddWithValue("#HPNumber", HPNUMBER.Text);
com.Parameters.AddWithValue("#Dob", DOB.Text);
com.Parameters.AddWithValue("#Address", ADDRESS.Text);
com.Parameters.AddWithValue("#State", STATE.Text);
com.Parameters.AddWithValue("#City", CITY.Text);
com.Parameters.AddWithValue("#PostCode", POSTCODE.Text);
com.Parameters.AddWithValue("#ICNumber", ICNUMBER.Text);

Use the parameters you created and remove extra commas
con = new SqlConnection(#"Data Source=dasranrajlui\sqlexpress;Initial Catalog=SESoriginal;Integrated Security=True");
con.Open();
com = con.CreateCommand();
com.CommandType = CommandType.Text;
com.CommandText = " update VoterRegistration set
SALUTATION #Salutation,
NAME = #Name,
SEX = #Sex,
ETHNICITY =#Ethnicity,
MARITALSTATUS = #MaritalStatus,
IC_NUMBER = #ICNumber,
HP_NUMBER = #HPNumber,
DOB = #Dob,
ADDRESS = #Address,
STATE = #State,
CITY = #City,
POSTCODE = #PostCode
where IC_NUMBER = #ICNumber";
com.CommandType = CommandType.Text;
com.Parameters.AddWithValue("#Salutation", SALUTATION.Text);
com.Parameters.AddWithValue("#Name", NAME.Text);
com.Parameters.AddWithValue("#Sex", SEX.Text);
com.Parameters.AddWithValue("#Ethnicity", ETHNICITY.Text);
com.Parameters.AddWithValue("#MaritalStatus", MARITALSTATUS.Text);
com.Parameters.AddWithValue("#ICNumber", ICNUMBER.Text);
com.Parameters.AddWithValue("#HPNumber", HPNUMBER.Text);
com.Parameters.AddWithValue("#Dob", DOB.Text);
com.Parameters.AddWithValue("#Address", ADDRESS.Text);
com.Parameters.AddWithValue("#State", STATE.Text);
com.Parameters.AddWithValue("#City", CITY.Text);
com.Parameters.AddWithValue("#PostCode", POSTCODE.Text);
com.Parameters.AddWithValue("#ICNumber", ICNUMBER.Text);

I suggest that you remove the , before where and add a quote around ICNUMBER.text
"', POSTCODE = '" + POSTCODE.Text + "' where IC_NUMBER = '" + ICNUMBER.Text +"'";

Updating Database on button click

i have a button that suppose to update data into the database.
private void button4_Click(object sender, EventArgs e)
{
//need update code//
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PEWPEWDIEPIE\\SQLEXPRESS;Initial Catalog=master;Integrated Security=True";
conn.Open();
SqlDataAdapter daCount = new SqlDataAdapter("select iCount from ComDet where cName = #cName", conn);
daCount.SelectCommand.Parameters.Add("#cName", SqlDbType.VarChar).Value = ListU.SelectedValue;
DataTable dtC = new DataTable();
daCount.Fill(dtC);
DataRow firstRow = dtC.Rows[0];
string x = firstRow["iCount"].ToString();
int y = Int32.Parse(x);
int z = y + 1;
//SqlCeCommand cmdC = conn.CreateCommand();
SqlCommand cmdC = conn.CreateCommand();
cmdC.CommandText = "Update ComDet set iCount = '" + z + "', ViewTime = '" + lblTime.Text + "', LastView = '" + txtUser2.Text + "' Where cName = '" + ListU.SelectedValue.ToString() + "'";
conn.Close();
}
but i get this error..
can someone help?
update =
i've changed my code to
cmdC.CommandText = "Update ComDet set iCount = " + z + ", ViewTime = '" + lblTime.Text + "', LastView = '" + txtUser2.Text + "' Where cName = '" + ListU.SelectedValue.ToString() + "'";
but the problem now is that , there's no update.
the iCount in the database is an INT , value is 0.
There is also no update for the viewtime and lastview.
where did i go wrong now?

change this:
cmdC.CommandText = "Update ComDet set iCount = '" + z + "', ViewTime = '" + lblTime.Text + "', LastView = '" + txtUser2.Text + "' Where cName = '" + ListU.SelectedValue.ToString() + "'";
to
cmdC.CommandText = "Update ComDet set iCount = " + z + ", ViewTime = '" + lblTime.Text + "', LastView = '" + txtUser2.Text + "' Where cName = '" + ListU.SelectedValue.ToString() + "'";
you dont need the "'" apostrophe around it becuase its a number. That would definitely get you string not in correct format error

I would guess maybe the icount value is not a number, i would recommend using TryParse just in case. And that should keep this error from happening. What to do about a bad value getting returned by the query is another issue.
private void button4_Click(object sender, EventArgs e)
{
//need update code//
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PEWPEWDIEPIE\\SQLEXPRESS;Initial Catalog=master;Integrated Security=True";
conn.Open();
SqlDataAdapter daCount = new SqlDataAdapter("select iCount from ComDet where cName = #cName", conn);
daCount.SelectCommand.Parameters.Add("#cName", SqlDbType.VarChar).Value = ListU.SelectedValue;
DataTable dtC = new DataTable();
daCount.Fill(dtC);
DataRow firstRow = dtC.Rows[0];
string x = firstRow["iCount"].ToString();
int y = 0;
if(Int32.TryParse(x,out y))
{
System.Diagnostics.Debug.WriteLine("iCount was an valid int32");
int z = y + 1;
//SqlCeCommand cmdC = conn.CreateCommand();
SqlCommand cmdC = conn.CreateCommand();
cmdC.CommandText = "Update ComDet set iCount = " + z + ", ViewTime = '" + lblTime.Text + "', LastView = '" + txtUser2.Text + "' Where cName = '" + ListU.SelectedValue.ToString() + "'";
}
else
System.Diagnostics.Debug.WriteLine("iCount was NOT a valid int32, value: " + x);
conn.Close();
}

Have you checked the value of the 'x' variable? The exception informs that the value of X isn't a valid integer, so the FormatException is thrown.

Error :Transaction is completed ,it is no longer usable

//How to exceute multiple sqlcommands in one transaction in C#..i am using like this but it gives me error..plz let me know what is problem with code..
string[] files = Directory.GetFiles(dir);
foreach (string subfiles in files)
{
con.Open();
SqlTransaction myTrans=null;
myTrans= con.BeginTransaction();
try
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.Transaction = myTrans;
cmd.CommandText = "select descr from genlookup where Code='SS_Purchase_No' and RecId=99998";
SqlDataReader drr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
DataTable dt = new DataTable();
//SqlDataAdapter da = new SqlDataAdapter(qry1, con);
DataTable dtw = new DataTable();
dtw.Load(drr);
DataSet dsr = new DataSet();
dsr.Tables.Add(dtw);
//SqlDataAdapter darun = new SqlDataAdapter("select descr from genlookup where Code='SS_Purchase_No' and RecId=99998", con);
//DataSet dsr = new DataSet();
//darun.Fill(dsr);
int run_no = Convert.ToInt32(dsr.Tables[0].Rows[0]["descr"].ToString());
filename = Path.GetFileNameWithoutExtension(subfiles);
string filenames = Path.GetFileName(subfiles);
if (subfiles.Trim().EndsWith(".xlsx"))
{
strConn = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 12.0 Xml;HDR=YES;IMEX=1\";", subfiles);
}
else if (subfiles.Trim().EndsWith(".xls"))
{
strConn = string.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\";", subfiles);
}
OleDbConnection exlcon = new OleDbConnection(strConn);
exlcon.Open();
string myTableName = exlcon.GetSchema("Tables").Rows[0]["TABLE_NAME"].ToString();
OleDbDataAdapter oledbadpt = new OleDbDataAdapter(String.Format("SELECT * FROM [{0}] ", myTableName), exlcon);
DataSet d_s = new DataSet();
oledbadpt.Fill(d_s);
exlcon.Close();
for (int i = 7; i < d_s.Tables[0].Rows.Count - 1; i++)
{
PARTNER_ID = d_s.Tables[0].Rows[i]["F1"].ToString();
RTV_LOCTN = d_s.Tables[0].Rows[i]["F3"].ToString();
DateTime date1 = Convert.ToDateTime(d_s.Tables[0].Rows[i]["F13"]);
string ddmm = date1.ToString("yyyyMMdd");
string[] aa = Color_size.Split('/');
// string colr="";
string size = "";
foreach (string ss in aa)
{
size = ss;
}
}
con.Open();
SqlCommand myCommand = new SqlCommand();
myCommand.Connection = con;
myCommand.Transaction = myTrans;
myCommand.CommandText = "insert into HSR_Purch_RETURN(PARTNER_ID,RTV_LOCTN)" +
" values('" + PARTNER_ID + "'," + "'" + RTV_LOCTN + "') ";
myCommand.ExecuteNonQuery();
//con.Open();
//SqlCommand cmdd = new SqlCommand(insert, con);
//int value1 = cmdd.ExecuteNonQuery();
//values = string.Empty;
con.Close();
if ((shrwcode != "") && (flag == "F"))
{
string zz = "select DistributionCenter,GLCountry,GLZone,GLState,GLCity from showroommaster where ShowroomCode='" + shrwcode + "'";
SqlDataAdapter da11 = new SqlDataAdapter(zz, con);
DataSet ds11 = new DataSet();
da11.Fill(ds11);
string Dcenter = ds11.Tables[0].Rows[0]["DistributionCenter"].ToString();
string GLCountry = ds11.Tables[0].Rows[0]["GLCountry"].ToString();
string fff = "select isnull(max(EntSrlNo),0)+1 as EntSrlNo from IDTableExtd where ShowroomCode='" + shrwcode + "' and DocDate='" + RTV_DATE + "'";
SqlDataAdapter das = new SqlDataAdapter(fff, con);
DataSet dss = new DataSet();
das.Fill(dss);
SqlCommand extdcmd = new SqlCommand();
extdcmd.Connection = con;
extdcmd.Transaction = myTrans;
string docpre = "PR" + RTV_DATE.Substring(2, 2);
if (dss.Tables[0].Rows.Count > 0)
{
slno = Convert.ToInt32(dss.Tables[0].Rows[0]["EntSrlNo"].ToString());
extdcmd.CommandText = "insert into IDTableExtd (ShowroomCode,TrnType,TrnCtrlNo,DocNoPrefix,docno,DocDate,EntSrlNo,StockNo,DistributionCenter,GLCountry,GLZone,GLState,GLCity,PartyType,PromoValue_LineLevel,DocQty,NetValue,BatchSrlNo)" +
"values ('" + shrwcode + "'," + "'2300'," + "'" + ddmm + "'," + "'" + docpre + "'," + "'" + ddmm + "'," + "'" + RTV_DATE + "'," + "'" + slno + "'," + "'" + TRN_STOCKNO + "'," + "'" + Dcenter + "'," + "'" + GLCountry + "'," + "'" + GLZone + "',"
+ "'" + GLState + "'," + "'" + GLCity + "','10'," + '0' + ",'" + RTV_QTY + "'," + "'" + RTV_cost + "','0')";
con.Open();
// SqlCommand extdcmd = new SqlCommand(instableextd, con);
extdcmd.ExecuteNonQuery();
con.Close();
}
}
}
myTrans.Commit(); ///Error is getting after exceuting this line..

You need refactor your´s code, first, and use something like that:
using (var = new SqlConnection(_connectionstring))
{
try
{
connection.Open();
using(SqlTransaction transaction = connection.BeginTransaction())
{
using (SqlCommand command1= new SqlCommand(commandtext, connection, transaction ))
{
//Do something here
}
using (SqlCommand command2= new SqlCommand(commandtext, connection, transaction ))
{
//Do another stuff here
}
...
transaction .Commit();
}
}
catch (Exception Ex)
{
if (transaction != null) transaction .Rollback();
}
}

(1)As Joseph said refactor your code using Using statement, which helps to dispose the objects properly.
(2)Your code is prone to SQL Injection, so use SQLParameter.
I've shown a sample from your code make it fully.
con.Open();
SqlCommand myCommand = new SqlCommand();
myCommand.Connection = con;
myCommand.Transaction = myTrans;
myCommand.CommandText = "insert into HSR_Purch_RETURN(PARTNER_ID,RTV_LOCTN) values(#partnerId,#rtv)";
myCommand.Parameters.Add(new SqlParameter("partnerId",PARTNER_ID));
myCommand.Parameters.Add(new SqlParameter("rtv",RTV_LOCTN));
myCommand.ExecuteNonQuery();
//con.Open();
//SqlCommand cmdd = new SqlCommand(insert, con);
//int value1 = cmdd.ExecuteNonQuery();
//values = string.Empty;
con.Close();

Pass value from one page to another page and update

I have 2 pages, page 1 include the gridview and I made one linkbutton that passes the ID to another page ( page 2). On page 2 I fill 10 textboxes and I have one button for edit info.
This code is for page 1 :
...
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="lbNextPage" runat="server"
PostBackUrl='<%# "~/secure/upst.aspx?id="+ Eval("ID_st") %>'>edit</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
...
and this is the code for page 2:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
txtID.Text = Request.QueryString["id"].ToString();
}
SqlConnection con = new SqlConnection(strcon);
string query = "select * from user_st where ID_st = #id";
SqlCommand cmd = new SqlCommand(query, con);
cmd.Parameters.AddWithValue("#id", stid);
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
dr.Read();
txtName.Text = dr["name"].ToString();
txtFamily.Text = dr["family"].ToString();
txtAddress.Text = dr["adres"].ToString();
txtHomeTel.Text = dr["home_tel"].ToString();
txtTahsilat.Text = dr["tahsilat"].ToString();
txtTel.Text = dr["celphone"].ToString();
txtEmail.Text = dr["email"].ToString();
txtShoghl.Text = dr["shoghl"].ToString();
txtAge.Text = dr["age"].ToString();
txtFadername.Text = dr["fader_name"].ToString();
txtIDnumber.Text = dr["melli_code"].ToString();
txtShSh.Text = dr["sh_sh"].ToString();
}
protected void btnOk_Click(object sender, EventArgs e)
{
Boolean res = false;
SqlConnection conn = new SqlConnection(strcon);
string famil = txtFamily.Text;
string name = txtName.Text;
string fader = txtFadername.Text;
string tahsil = txtTahsilat.Text;
Double telhome = Convert.ToDouble(txtHomeTel.Text);
string adres = txtAddress.Text;
Double cel = Convert.ToDouble(txtTel.Text);
string email = txtEmail.Text;
Double shsh = Convert.ToDouble(txtIDnumber.Text);
string shoghl = txtShoghl.Text;
int age = Convert.ToInt32(txtAge.Text);
Double melli = Convert.ToDouble(txtIDnumber.Text);
int id = Convert.ToInt32(txtID.Text);
string query = "update user_st set name=#name ,fader_name=#fader ,family=#famil,tahsilat=#tahsil,adres=#adres,home_tel=#telhome,celphone=#cel,email=#email ,sh_sh=#shsh,shoghl=#shoghl,age=#age,melli_code=#melli where ID_st=#id";
SqlCommand cmdup = new SqlCommand(query, conn);
cmdup.Parameters.AddWithValue("#name",name);
cmdup.Parameters.AddWithValue("#fader_name",fader );
cmdup.Parameters.AddWithValue("#family", famil);
cmdup.Parameters.AddWithValue("#tahsilat",tahsil);
cmdup.Parameters.AddWithValue("#adres", adres);
cmdup.Parameters.AddWithValue("home_tel",telhome );
cmdup.Parameters.AddWithValue("#celphone",cel );
cmdup.Parameters.AddWithValue("#email", email);
cmdup.Parameters.AddWithValue("#sh_sh", shsh);
cmdup.Parameters.AddWithValue("#shoghl", shoghl);
cmdup.Parameters.AddWithValue("#age",age );
cmdup.Parameters.AddWithValue("#melli_code", melli);
cmdup.Parameters.AddWithValue("#id", id);
try
{
conn.Open();
cmdup.ExecuteNonQuery();
conn.Close();
res = true;
}
catch (SqlException ex)
{
lblRes.Text = "error" + ex.ToString();
}
if (res)
{
lblResult.Text = "Ok";
}
That is not working so, I tried this:
//cmdup.Parameters.Add("#name", SqlDbType.NVarChar, 50).Value = txtName.Text;
//cmdup.Parameters.Add("#fader_name", SqlDbType.NVarChar, 50).Value = txtFadername.Text;
//cmdup.Parameters.Add("#family", SqlDbType.NVarChar, 50).Value = txtFamily.Text;
//cmdup.Parameters.Add("#tahsilat", SqlDbType.NVarChar, 50).Value = txtTahsilat.Text;
//cmdup.Parameters.Add("#adres", SqlDbType.NVarChar, 150).Value = txtAddress.Text;
//cmdup.Parameters.Add("home_tel", SqlDbType.Char, 10).Value = txtHomeTel.Text;
//cmdup.Parameters.Add("#celphone", SqlDbType.Char, 10).Value = txtTel.Text;
//cmdup.Parameters.Add("#email", SqlDbType.VarChar).Value = txtEmail.Text;
//cmdup.Parameters.Add("#sh_sh", SqlDbType.Char, 10).Value = txtShSh.Text;
//cmdup.Parameters.Add("#shoghl", SqlDbType.NVarChar, 50).Value = txtShoghl.Text;
//cmdup.Parameters.Add("#age", SqlDbType.Int).Value = txtAge.Text;
//cmdup.Parameters.Add("#melli_code", SqlDbType.Char, 10).Value = txtIDnumber.Text;
//cmdup.Parameters.Add("#id", SqlDbType.Int).Value = txtID.Text;
or this :
//SqlCommand cmdup = new SqlCommand("EXEC up_st'" + txtName.Text. + "' , '" + txtFamily.Text + "' , '" + txtTahsilat.Text +"' , '" + txtAddress.Text + "' , '"
// + txtHomeTel.Text + "' , '" + txtTel.Text + "' , '" + txtEmail.Text + "' , '" + txtShoghl.Text + "' , '"
// + txtAge.Text + "' , '" + txtFadername.Text + "' , '" + txtIDnumber.Text + "' , '" + txtShSh.Text + "' , '"
// + txtID.Text + "'", conn);
or this :
/*"update user_st set name='" + txtName.Text + "',fader_name='" + txtFadername.Text + "',family='" + txtFamily.Text + "',tahsilat='" + txtTahsilat.Text + "',adres='" + txtAddress.Text + "',home_tel='" + txtHomeTel.Text + "',celphone='"
+ txtTel.Text + "',email='" + txtEmail.Text + "',sh_sh='" + txtShSh.Text + "',shoghl='" + txtShoghl.Text + "',age='" + txtAge.Text + "',melli_code='" + txtIDnumber.Text + "' where ID_st=" + txtID.Text*/
but it also doesn't work.

You need to move your initial Sql select into the !IsPostback block because what's happening is you are posting back your updates, but Page_Load fires before the textboxes are updated. So everything is working in your initial code, you are just updating it with the initial information. Try this:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
txtID.Text = Request.QueryString["id"].ToString();
SqlConnection con = new SqlConnection(strcon);
string query = "select * from user_st where ID_st = #id";
SqlCommand cmd = new SqlCommand(query, con);
cmd.Parameters.AddWithValue("#id", stid);
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
dr.Read();
txtName.Text = dr["name"].ToString();
txtFamily.Text = dr["family"].ToString();
txtAddress.Text = dr["adres"].ToString();
txtHomeTel.Text = dr["home_tel"].ToString();
txtTahsilat.Text = dr["tahsilat"].ToString();
txtTel.Text = dr["celphone"].ToString();
txtEmail.Text = dr["email"].ToString();
txtShoghl.Text = dr["shoghl"].ToString();
txtAge.Text = dr["age"].ToString();
txtFadername.Text = dr["fader_name"].ToString();
txtIDnumber.Text = dr["melli_code"].ToString();
txtShSh.Text = dr["sh_sh"].ToString();
}
}
If you really want to reload the stuff from the database, you can pop that query into a function and re-run it after the button click update in the button click function (at the end), but there really is no reason since the textboxes will already have the same info.