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;
}
}
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 !
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();
}
I'm writing a program using C# win forms and SQL Server 2012. In one of my forms I have a combobox a button and a datagrid view. I want the data grid view to be filled every time I change the value in combo box.
This code doesn't work :( (it does not return an error)
private void button1_Click(object sender, EventArgs e)
{
int id = Convert.ToInt32(comboBox2.SelectedValue.ToString());
//int idc = 100;
DataSet ptDataset = new DataSet();
string con = ConfigurationManager.ConnectionStrings["secaloFormulaCS"].ToString();
SqlConnection sqlCon = new SqlConnection(con);
sqlCon.Open();
SqlCommand sqlCmd = new SqlCommand("spDispProductInfo", sqlCon);
sqlCmd.CommandType = CommandType.StoredProcedure;
sqlCmd.Parameters.AddWithValue("#id", id);
sqlCmd.ExecuteNonQuery();
SqlDataAdapter da = new SqlDataAdapter(sqlCmd);
da.Fill(ptDataset);
dataGridView2.DataSource = ptDataset;
sqlCon.Close();
}
Try this.
int id = Convert.ToInt32(comboBox2.SelectedValue.ToString());
//int idc = 100;
DataSet ptDataset = new DataSet();
string con = ConfigurationManager.ConnectionStrings["secaloFormulaCS"].ToString();
SqlConnection sqlCon = new SqlConnection(con);
sqlCon.Open();
SqlCommand sqlCmd = new SqlCommand("spDispProductInfo", sqlCon);
sqlCmd.CommandType = CommandType.StoredProcedure;
sqlCmd.Parameters.AddWithValue("#id", id);
SqlDataAdapter da = new SqlDataAdapter(sqlCmd);
da.Fill(ptDataset);
dataGridView2.DataSource = ptDataset.Tables[0];
sqlCon.Close();
You must Use the Event of your comboBox clik not the button.
Just try to add this button1_click event to the combobox that you have.
Set your Code in SelectedIndexChanged event Of your comboBox
private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
DataSet ptDataset = new DataSet();
string con = ConfigurationManager.ConnectionStrings["secaloFormulaCS"].ToString();
SqlConnection sqlCon = new SqlConnection(con);
sqlCon.Open();
SqlCommand sqlCmd = new SqlCommand("spDispProductInfo", sqlCon);
sqlCmd.CommandType = CommandType.StoredProcedure;
sqlCmd.Parameters.AddWithValue("#id", Convert.ToInt32(comboBox2.SelectedValue.ToString()));
sqlCmd.ExecuteNonQuery();
SqlDataAdapter da = new SqlDataAdapter(sqlCmd);
da.Fill(ptDataset);
dataGridView2.DataSource = ptDataset;
sqlCon.Close();
}
I have two drop down list in which i am getting data displayed from database.
When College Name in DropDownList2 is selected only related branches must be shown in of that college in DropDownList1 for this i had used a Stored Procedure and it was working fine when i run it in manually by passing Parameteres.
But while executing code i all branches are displayed.do i need have any Post Back ?
Please help me in this scenario.
Below is my code:
string queryString = "select College_Name from Colleges";
string constring = System.Configuration.ConfigurationManager.ConnectionStrings["ConnDBForum"].ConnectionString;
SqlConnection connection = new SqlConnection(constring);
SqlCommand command = new SqlCommand(queryString, connection);
connection.Open();
DataTable dt = new DataTable();
SqlDataAdapter ad = new SqlDataAdapter(command);
ad.Fill(dt);
if (dt.Rows.Count > 0)
{
DropDownList2.Items.Insert(0, new ListItem(String.Empty, String.Empty));
DropDownList2.DataSource = dt;
DropDownList2.DataTextField = "College_Name";
DropDownList2.DataValueField = "College_Name";
DropDownList2.DataBind();
DropDownList2.Items.Insert(0, new ListItem(String.Empty, String.Empty));
}
SqlCommand Cmd = new SqlCommand("Branch_display", connection);
Cmd.CommandType = CommandType.StoredProcedure;
Cmd.Parameters.Add(new SqlParameter("#College_Name", DropDownList2.SelectedValue));
DataTable dt1 = new DataTable();
SqlDataAdapter ad1 = new SqlDataAdapter(Cmd);
ad1.Fill(dt1);
if (dt1.Rows.Count > 0)
{
DropDownList1.DataSource = dt1;
DropDownList1.DataTextField = "Name";
DropDownList1.DataValueField = "Name";
DropDownList1.DataBind();
DropDownList1.Items.Insert(0, new ListItem(String.Empty, String.Empty));
}
connection.Close();
}
yes you need to have a post back somethink like this should help
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
string queryString = "select College_Name from Colleges";
string constring=System.Configuration.ConfigurationManager.ConnectionStrings["ConnDBForum"].ConnectionString;
SqlConnection connection = new SqlConnection(constring);
SqlCommand command = new SqlCommand(queryString, connection);
connection.Open();
DataTable dt = new DataTable();
SqlDataAdapter ad = new SqlDataAdapter(command);
ad.Fill(dt);
if (dt.Rows.Count > 0)
{
DropDownList2.Items.Insert(0, new ListItem(String.Empty, String.Empty));
DropDownList2.DataSource = dt;
DropDownList2.DataTextField = "College_Name";
DropDownList2.DataValueField = "College_Name";
DropDownList2.DataBind();
DropDownList2.Items.Insert(0, new ListItem(String.Empty, String.Empty));
}
connection.Close();
}
}
asp.net render
<asp:dropdownlist ID=" DropDownList2" runat="server" AutoPostBack="True" OnSelectedIndexChanged=" DropDownList2_SelectedIndexChanged">
and action
private void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
{
string constring=System.Configuration.ConfigurationManager.ConnectionStrings["ConnDBForum"].ConnectionString;
SqlCommand Cmd = new SqlCommand("Branch_display", connection);
Cmd.CommandType = CommandType.StoredProcedure;
Cmd.Parameters.Add(new SqlParameter("#College_Name", DropDownList2.SelectedValue));
DataTable dt1 = new DataTable();
SqlDataAdapter ad1 = new SqlDataAdapter(Cmd);
ad1.Fill(dt1);
if (dt1.Rows.Count > 0)
{
DropDownList1.DataSource = dt1;
DropDownList1.DataTextField = "Name";
DropDownList1.DataValueField = "Name";
DropDownList1.DataBind();
DropDownList1.Items.Insert(0, new ListItem(String.Empty, String.Empty));
}
connection.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);
}