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I have a button ADD CV. When a user logs on to the website, I check a table "cv" {id_member, id_cv}, if the id_member exists already in the table, the ADD CV button is disabled, otherwise the user can click it.
I retrieve all id_members from DB in a list (c) of classes (cv { int Id_candidat}). I need to check for the existence of logged user's id in this list (extracted from the Session variable).
This how I do it, but it's not working:
protected void Page_Load(object sender, EventArgs e)
{
List<cv> c = new List<cv>();
SqlConnection con = new SqlConnection(#"Data Source=p5-pc\sqlexpress;" +
"Initial Catalog=recrutement_online_3;Integrated Security=True");
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
con.Open();
cmd.CommandText = "select id_candidat from cv";
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
cv p3 = new cv();
p3.Id_candidat = int.Parse(dr[0].ToString());
c.Add(p3);
}
dr.Close();
con.Close();
cv r = new cv();
r.Id_candidat = int.Parse(Session["Id_candidat"].ToString());
if (c.Contains(r))
{
Button1.Enabled = false;
}
...
My question is, How can I check for the existance of logged user's cv in database?
You can check for candidate existence when filling the list of available cvs:
...
bool candidatExists = false;
int idCandidat = int.Parse(Session["Id_candidat"].ToString());
while (dr.Read())
{
cv p3 = new cv();
p3.Id_candidat = int.Parse(dr[0].ToString());
c.Add(p3);
if(p3.Id_candidat == idCandidat)
{
candidatExists = true;
}
}
dr.Close();
con.Close();
Button1.Enabled = !candidatExists;
You can use linq Any to check for the existence of the candidate ID in the CV's list assuming that you've exposed a non private id member of your cv class (you haven't been clear):
bool showAddCvBtn = c.Any(id => id.id_member == r.Id_candidat);
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private void button2_Click(object sender, EventArgs e)
{
string connectionString = "server=Hosam; database=Login; Integrated security=true";
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("select recive from logmain",con);
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
while(reader.Read())
{
string check = reader.GetString(0);
MessageBox.Show("this is"+check);
string doc = "doctor";
if (check==doc)
{
doctorform1.Visible = true;
laboratoryform1.Visible = false;
registration1.Visible = false;
nurseform1.Visible = false;
}
else if(check!=doc)
{
MessageBox.Show("You don't have acess");
}
}
con.Close();
It's always returning you don't have access even when the statement is true
I have tried to change the data type to var
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I have multiple Checkboxes in a page and their values are being stored in one column. Now I want that if I get data from Db then Checkbox is checked if their value is store in that column.
What Store Procedure and C# code I use for this?
Here is my code;
private void SetRoles()
{
SqlCommand cmd2 = new SqlCommand("SPD_GetAllUsersList");
cmd2.CommandType = CommandType.StoredProcedure;
cmd2.Parameters.AddWithValue("#id", "ABC01");
SqlDataAdapter sda2 = new SqlDataAdapter();
cmd2.Connection = con;
sda2.SelectCommand = cmd;
DataTable dt2 = new DataTable();
sda2.Fill(dt2);
con.Open();
SqlDataReader dr2 = cmd2.ExecuteReader();
bool recfound2 = dr2.Read();
if (recfound2)
{
if (dt2.Columns[0].ToString() == "Add Staff".ToString())
{
CBAddStaff.Checked = true;
}
else
{
CBAddStaff.Checked = false;
}
if (dt2.Columns[0].ToString() == "Update Staff".ToString())
{
CBAUpdateStaff.Checked = true;
}
else
{
CBAUpdateStaff.Checked = false;
}
}
con.Close();
}
There are many things wrong with your peace of code my friend
Your code for reading data from database is too long, and doesn't even make much sense. Try this:
A little tip: read the data in a separate method.
private DataTable ReadRoles()
{
var cmd = new SqlCommand("SPD_GetAllUsersList");
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#id", "ABC01");
var con = new SqlConnection("YourConnectionString");
var sda = new SqlDataAdapter(cmd, con);
var cmb = new SqlCommandBuilder(sda);
var ds = new DataSet();
sda.Fill(ds);
return ds.Tables[0];
}
Now we store the returned DataTable in a variable, and search through that:
var Roles = ReadRoles();
CBAddStaff.Checked = false;
CBAUpdateStaff.Checked = false;
foreach (DataRow row in Roles)
{
if (row["RoleId"].ToString() == "Add Staff") CBAddStaff.Checked = true;
else if (row["RoleId"].ToString() == "Update Staff") CBAUpdateStaff.Checked = true;
else continue;
}
Now, if you really need to use all of this in one method, I suggest you create method that does everything in the second piece of code I wrote: Call the ReadRoles(), uncheck both ckechboxes (so you don't need if-else , if-else), and set Checked of the right checkbox to true
Don't forget to vote and accept if you find this helpful
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I want to check if the input tbNRIC exist in the database.
protected void btnSubmit_Click(object sender, EventArgs e)
{
string strNric = tbNRIC.Text;
Session["nric"] = strNric;
{
using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["EADPRJConnectionString"].ConnectionString))
{
con.Open();
SqlDataReader myReader = null;
SqlCommand myCommand = new SqlCommand("select PNRIC from Patient", con);
myReader = myCommand.ExecuteReader();
while (myReader.Read())
{
if (myReader[1].ToString() == tbNRIC.Text)
{
flag = true;
break;
}
}
if (flag == true)
Response.Write("<script>alert('Patient Profile Successfully Deleted');window.location ='ClientUpdate.aspx';</script>");
else
Response.Write("<script>alert('Patient Profile Unsuccessfully Updated');</script>");
}
}
}
I strongly suspect you try to read second column since you write myReader[1]. A reader indexing is zero-based. You might need to change it as myReader[0].
Also I prefer to use GetXXX methods of reader as a personal reference which I found it more readable.
if (myReader.GetString(0) == tbNRIC.Text)
Also use using statement to dispose your command and reader as you did for your connection.
You are accessing the second column with myReader[1] but you're selecting only one.
Use the Where-clause instead of reading all from the table. You could also use ExecuteScalar since you only want a single bool value:
using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["EADPRJConnectionString"].ConnectionString))
{
string sql = #"SELECT CAST(CASE WHEN EXISTS(SELECT 1 FROM Patient
WHERE PNRIC = #PNRIC)
THEN 1 ELSE 0 END AS BIT)";
using (var myCommand = new SqlCommand(sql, con))
{
myCommand.Paramaters.Add("#PNRIC", SqlDbType.NVarChar).Value = tbNRIC.Text;
con.Open();
bool deleted = (bool)myCommand.ExecuteScalar();
// ...
}
}
It will be better if You check patient existance without load all records from DB.
Do somthing like this:
SqlCommand myCommand = new SqlCommand("select PNRIC from Patient where PNRIC = #PNRIC", con);
myCommand.Parameters.AddWithValue("#PNRIC", tbNRIC.Text);
and check if you can read any row.
It would be better if you apply the filter at Command Text. Something like :
var strsql = "select PNRIC from Patient where PNRIC='"+ tbNRIC.Text + "'";
SqlCommand myCommand = new SqlCommand(strsql , con);
....
var flag = false;
myReader = myCommand.ExecuteReader();
if(myReader .HasRows) flag = true;
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I don't Have any Idea about FingerPrint Scanner. Anyone know about how to save fingerPrint into database and match the fingerPrints in C# Asp.net. I'm using DigitalPersona and Microsoft Visual Studio 2010.
Do you give me some code snippets for this?
I shall be very thankful to you...
Regards
Zargham Nazeer Malik
You are using digital persona. after installing , a folder will be saved in c directory. Please check , code is present in that folder.It could already register and verify fingerprints
Below code is to save in database....
private void SaveButton_Click(object sender, EventArgs e)
{
MemoryStream fingerprintData = new MemoryStream();
Template.Serialize(fingerprintData);
fingerprintData.Position = 0;
BinaryReader br = new BinaryReader(fingerprintData);
Byte[] bytes = br.ReadBytes((Int32)fingerprintData.Length);
//Insert the file into database
SqlConnection cn = new SqlConnection("Data Source=10.115.5.3; Initial Catalog=EnrollmentSampledb;Integrated Security=SSPI;");
SqlCommand cmd = new SqlCommand("INSERT INTO tblUser VALUES(#ID_NUMBER, #FIRSTNAME, #LASTNAME, #FINGERPRINT, #DATE_ADDED, #DATE_MODIFIED)", cn);
cmd.Parameters.Add("ID_NUMBER", SqlDbType.NVarChar).Value = tboxIdNum.Text;
cmd.Parameters.Add("FIRSTNAME", SqlDbType.NVarChar).Value = tboxFname.Text;
cmd.Parameters.Add("LASTNAME", SqlDbType.NVarChar).Value = tboxLname.Text;
cmd.Parameters.Add("FINGERPRINT", SqlDbType.Image).Value = bytes;
cmd.Parameters.Add("DATE_ADDED", SqlDbType.DateTime).Value = DateTime.Now;
cmd.Parameters.Add("DATE_MODIFIED", SqlDbType.DateTime).Value = DateTime.Now;
cn.Open();
cmd.ExecuteNonQuery();
cn.Close();
tboxIdNum.Text = "";
tboxFname.Text = "";
tboxLname.Text = "";
}
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I want to write a client query (full name, age, telephone, image, etc) using the combobox (choosing a name) and automatically want the data to be displayed in the textbox. It works ok except the image and throws an error:
There is no row at position 0
My code:
//combobox load
private void cbmodificar_SelectedIndexChanged(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source=MELVIN-PC\\SQLEXPRESS; Initial Catalog= World_Computers; Integrated Security=True;");
string query = "select * from agregar_cliente where Nombre='" + cbmodificar.Text + "'";
SqlCommand comando = new SqlCommand(query, conn);
conn.Open();
SqlDataReader leer = comando.ExecuteReader();
if (leer.Read() == true)
{
idclienteTextBox.Text = leer["idcliente"].ToString();
txtnombre.Text = leer["Nombre"].ToString();
txtapellido.Text = leer["Apellido"].ToString();
txtcedula.Text = leer["Cedula"].ToString();
txtedad.Text = leer["Edad"].ToString();
txttelefono.Text = leer["Teléfono"].ToString();
txtdireccion.Text = leer["Dirreción"].ToString();
txtcorreo.Text = leer["Correo"].ToString();
cbestado.Text = leer["Estado"].ToString();
cbsexo.Text = leer["Sexo"].ToString();
}
else
{
idclienteTextBox.Text="";
txtnombre.Text="";
txtapellido.Text="";
txtcedula.Text="";
txtedad.Text="";
txttelefono.Text="";
txtdireccion.Text="";
txtcorreo.Text="";
cbestado.Text="";
cbsexo.Text = "";
}
leer.Close();
DataSet ds = new DataSet("agregar_cliente");
SqlDataAdapter dp = new SqlDataAdapter(query,conn);
byte[] misdatos = new byte[0];
dp.Fill(ds, "agregar_cliente");
DataRow myrow = ds.Tables["agregar_cliente"].Rows[0]; //<<< i dont know//
misdatos = (byte[])myrow["Imagen"];
MemoryStream ms = new MemoryStream(misdatos);
imagenPictureBox.Image = Image.FromStream(ms);
}
You need to check if there is a row that you want to access,
if (ds.Tables["agregar_cliente"].Rows.Count > 0)
{
DataRow myrow = ds.Tables["agregar_cliente"].Rows[0];
......
}