Code seems to be fine but when i click it, nothing happens.
THanks!
private void button2_Click(object sender, EventArgs e)
{
MySqlDataAdapter da = new MySqlDataAdapter();
da.SelectCommand = new MySqlCommand("select * from poitems", coninsert);
MySqlCommandBuilder cb = new MySqlCommandBuilder(da);
DataSet ds = new DataSet();
da.Fill(ds, "poitems");
da.Update(ds, "poitems");
//DataTable dt1 = new DataTable();
//da.Fill(dt1);
//da.Update(dt1);
//dtgPo.DataSource = dt1;
}
you are not updating anything in your dataset, check below sample update code
MySqlConnection conn = new MySqlConnection(connectionString);
MySqlDataAdapter da = new MySqlDataAdapter("SELECT * FROM Test", conn);
MySqlCommandBuilder cb = new MySqlCommandBuilder(da, true);
DataTable dt = new DataTable();
da.Fill(dt);
//update datatable
dt.Rows[0][0] = "my changed value";
DataTable changes = dt.GetChanges();
//call update
da.Update(changes);
dt.AcceptChanges();
Related
Hi i want to save edits in DataGriView to datatable , i tried that code but an error shows 'System.ArgumentOutOfRangeException: 'The index was out of range. It must not be negative and must be smaller than the size of the collection.
Parameter name: index '' help
private void button11_Click(object sender, EventArgs e)
{
con.Open();
String query = "SELECT * FROM Taom";
SqlDataAdapter SDA = new SqlDataAdapter(query, con);
DataTable dt1 = new DataTable();
DataSet ds1 = new DataSet();
DataTable dt = new DataTable();
dataGridView1.DataSource = dt1;
SDA.Fill(dt);
dataGridView1.Rows[2].Cells[2].Value = Math.Atan((Convert.ToDouble(dataGridView1.Rows[5].Cells[2].Value)) / (Convert.ToDouble(dataGridView1.Rows[6].Cells[2].Value)));
dataGridView1.Rows[3].Cells[2].Value = Math.Atan((Convert.ToDouble(dataGridView1.Rows[7].Cells[2].Value)) / (Convert.ToDouble(dataGridView1.Rows[8].Cells[2].Value)));
ds1.Tables.Add(dt);
con.Close();}
I changed my code to that code no errors showed after i run values on datagridview change but no changes in datatable !!!
string query = "SELECT * FROM [dbo].[Taom]";
SqlConnection conn = new SqlConnection(#"Data Source=STE-P0024818PW;Initial Catalog=test;Integrated Security=True");
conn.Open();
SqlDataAdapter SDA = new SqlDataAdapter(query, conn);
DataSet ds1 = new DataSet();
DataTable dt = new DataTable();
SDA.Fill(dt);
dt.Rows[0]["Contents"] = "98"; //Before it was 10
dt.Rows[1]["Contents"] = "99"; //Before it was 11
ds1.Tables.Add(dt);
conn.Close();
Fill the right value inside your table and after pass the table rightly filled in your datasource, don't change this directly in the gridview like:
I try myself and it works:
private void Run()
{
string query = "SELECT * FROM dbo.[Anrufthema]";
SqlConnection conn = new SqlConnection("MyConnectionString");
conn.Open();
SqlDataAdapter SDA = new SqlDataAdapter(query, conn);
DataSet ds1 = new DataSet();
DataTable dt = new DataTable();
SDA.Fill(dt);
dt.Rows[0]["Anrufthema"] = "98"; //Before it was 10
dt.Rows[1]["Anrufthema"] = "99"; //Before it was 11
ds1.Tables.Add(dt);
conn.Close();
}
My Result, it works !
I am new in using visual studio and ADO.NET. I want to display result from sqlserver database in data gridview.
This is my code but it does not fill data to gridview.
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection();
SqlCommand Cmd = new SqlCommand("sp_Expert_person", con);
con.Open();
Cmd.CommandType = CommandType.StoredProcedure;
Cmd.Parameters.Add("#takhasos", SqlDbType.VarChar).Value = comboBox1.SelectedText;
SqlDataAdapter da = new SqlDataAdapter(Cmd);
SqlCommandBuilder commandBuilder = new SqlCommandBuilder(da);
DataTable dt = new DataTable();
da.Fill(dt);
SqlDataReader reader = Cmd.ExecuteReader();
dt.Load(reader);
dataGridView1.DataSource = dt;
this.dataGridView1.Visible = true;
dataGridView1.DataSource = dt;
}
Why are you binding to grid two times?
If your application is ASP.NET Webforms and you are trying to bind the GridView(ID for the GridView is "dataGridView1"), then make your binding to single time and to bind data for GridView you need to use dataGridView1.DataBind(); after dataGridView1.DataSource = dt;
If your application is WindowsForms application then modify your code like below
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
dataGridView1.DataSource = null;
string connectionString = "Define your connection string here";
using(SqlConnection con = new SqlConnection(connectionString ))
{
SqlCommand cmd = new SqlCommand("sp_Expert_person", con);
con.Open();
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("#takhasos", SqlDbType.VarChar).Value = comboBox1.SelectedText;
SqlDataAdapter da = new SqlDataAdapter(cmd);
SqlCommandBuilder commandBuilder = new SqlCommandBuilder(da);
DataTable dt = new DataTable();
da.Fill(dt);
this.dataGridView1.Visible = true;
dataGridView1.DataSource = dt;
}
}
private void button1_Click(object sender, EventArgs e)
{
con.Open();
SqlDataAdapter da = new SqlDataAdapter(
"select CustomerName,CompanyName,ContactNo from tbl_LeadFollowUp where WorkType='internet shopping'", con);
DataSet ds = new DataSet();
DataTable dt = new DataTable();
da.Fill(ds);
da.Fill(dt);
foreach (DataRow row in dt.Rows)
{
textBox1.Text = (row["CompanyName"].ToString());
textBox2.Text = (row["CustomerName"].ToString());
label2.Text = (row["ContactNo"].ToString());
}
con.close();
}
You have to use DataGridview for binding the multiple data from Database to UI.
You can't iterate multiple data to single lable. It will get overwrite not append
private void button1_Click(object sender, EventArgs e)
{
con.Open();
SqlDataAdapter da = new SqlDataAdapter("select CustomerName,CompanyName,ContactNo from tbl_LeadFollowUp where WorkType='internet shopping'", con);
DataSet ds = new DataSet();
DataTable dt = new DataTable();
da.Fill(ds);
da.Fill(dt);
dataGridView1.DataSource = da;
dataGridView1.DataMember = "Lead";
con.close();
}
Can anyone help please, I am trying to populate the data automatically to my combobox without having to push any button, but by the dropdown control.....
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBox1.AllowDrop == false)
{
SqlConnection conn = new SqlConnection("Data Source=localhost; database=KnowledgeEssentials;Trusted_Connection=yes;connection timeout=30");
SqlDataAdapter adapter = new SqlDataAdapter("SELECT Problem FROM PROBLEMT", conn);
DataTable dt = new DataTable();
DataSet ds = new DataSet();
SqlDataAdapter ad = new SqlDataAdapter();
ad.SelectCommand = new SqlCommand("SELECT Problem FROM PROBLEMT", conn);
ad.Fill(ds, "Problem");
dataGridView1.DataSource = dt;
//Biding the data with the control
BindingSource bs = new BindingSource();
bs.DataSource = ds;
bs.DataMember = "Problem";
DataGridView dvg = new DataGridView();
this.Controls.Add(dvg);
dvg.DataSource = bs;
for (int i = 0; i < dt.Rows.Count; i++)
{
comboBox1.Items.Add(dt.Rows[i]["Problem"]);
}
}
else
{
}
}
you are missing a } and I hardly believe that SelectedIndexChanged is the best place to populate a combobox. Since obviously you are learning, try to put your code on a button, once it is working fine from the click of the button, you can look for a better place to it, like the form load for example.
also what exactly is the problem? does it give an error?
first create method for fetching data and load in combobox like this
protected void LoadCombo()
{
SqlConnection conn = new SqlConnection("Data Source=localhost;database=KnowledgeEssentials;Trusted_Connection=yes;connection timeout=30");
SqlDataAdapter adapter = new SqlDataAdapter("SELECT Problem FROM PROBLEMT", conn);
DataSet ds = new DataSet();
SqlDataAdapter ad = new SqlDataAdapter();
ad.SelectCommand = new SqlCommand("SELECT Problem FROM PROBLEMT", conn);
ad.Fill(ds, "Problem");
dataGridView1.DataSource = ds;
dataGridView1.DataBind();
for (int X = 0; X <= ds.Tables[0].Rows.Count - 1; X++)
{
comboBox1.Items.Add(ds.Tables[0].Rows[X]["Problem"].ToString());
}
}
now on page_load call this method
protected void Page_Load()
{
if(ispostback)
{
}
else
{
LoadCombo();
}
}
Answer to the question on how to populate a combobox automatically:
private void Form3_Load(object sender, EventArgs e)
{
using (SqlConnection sc = new SqlConnection())
{
sc.ConnectionString= "database=KnowledgeEssentials;Trusted_Connection=yes;connection timeout=30";
sc.Open();
using (SqlDataAdapter sda = new SqlDataAdapter())
{
DataTable data = new DataTable();
sda.SelectCommand = new SqlCommand("SELECT ID, TypeProblem FROM eL_Section", sc);
sda.Fill(data);
comboBox1.ValueMember = "ID";
comboBox1.DisplayMember = "ID";
comboBox1.DataSource = data;
comboBox2.ValueMember = "TypeProblem";
comboBox2.DisplayMember = "TypeProblem";
comboBox2.DataSource = data;
}
}
using (SqlConnection cn = new SqlConnection())
{
cn.ConnectionString = "database=KnowledgeEssentials;Trusted_Connection=yes;connection timeout=30";
cn.Open();
using (SqlDataAdapter da = new SqlDataAdapter())
{
DataTable dat = new DataTable();
da.SelectCommand = new SqlCommand("SELECT UserName FROM UserT", cn);
da.Fill(dat);
comboBox3.ValueMember = "UserName";
comboBox3.DisplayMember = "UserName";
comboBox3.DataSource = dat;
}
}
// TODO: This line of code loads data into the 'knowledgeEssentialsDataSet.ProblemT' table. You can move, or remove it, as needed.
this.problemTTableAdapter.Fill(this.knowledgeEssentialsDataSet.ProblemT);
}
I've a frmEdit with datagridview that's bouned to this:
string sqlqry1 = "select p_Name from Items where p_Id=" + p_Id;
using (SqlCeDataAdapter a = new SqlCeDataAdapter(sqlqry1, conn))
{
DataTable dt1 = new DataTable();
a.Fill(dt1);
dataGridView1.DataSource = dt1;
}
How to edit cells and save them back to the db?, tried using this:
using (SqlCeDataAdapter a = new SqlCeDataAdapter(sqlqry1, conn))
{
DataTable dt1 = new DataTable();
a.Fill(dt1);
dataGridView1.DataSource = dt1;
a.Update(dt1);
}
Nothing.
Is there anyway?.
Found solution:
SqlCeDataAdapter da;
SqlCeCommandBuilder cmdBuilder;
da = new SqlCeDataAdapter("select * from Items", conn);
cmdBuilder = new SqlCeCommandBuilder(da);
da.Fill(myDatabaseDataSet, "Items");
myDatabaseDataSet.Tables["Items"].Rows[0]["p_Name"] = dataGridView1.Rows[0].Cells["p_Name"].Value.ToString();
da.Update(myDatabaseDataSet, "Items");
DataTable dT;
BindingSource bS;
using (SqlCeConnection yourConnection = new SqlCeConnection("Data Source=|DataDirectory|\\YourDatabase.sdf"))
{
dT = new DataTable();
bS = new BindingSource();
string query = "SELECT * FROM table01";
SqlCeDataAdapter dA = new SqlCeDataAdapter(query, yourConnection);
SqlCeCommandBuilder cBuilder = new SqlCeCommandBuilder(dA);
dA.Fill(dT);
bS.DataSource = dT;
dgv01.DataSource = bS;
}
Resurrecting this with a working example because of this pages rank on google.