are you initiating a connection to the SQL instance? Your gridview will not populate unless you are directly connected to the database.
SQL conn = new SQL connection (connection string)
You can test this by calling the query or changing the query to alter a row in the database. If the database changes then you are already connected.
Might want to try initializing a new GridView instance also...
Here's a reference...
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.gridview.aspx
So here is the work from school.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DataSet ds = new DataSet();
DataTable dt = new DataTable();
dt.Columns.Add("Project_ID", Type.GetType("System.Int32"));
dt.Columns.Add("ProjectName", Type.GetType("System.String"));
DataSet dsProd = new DataSet();
DataTable dtProd = new DataTable();
dtProd.Columns.Add("Product_ID", Type.GetType("System.Int32"));
dtProd.Columns.Add("Product_Name", Type.GetType("System.String"));
SqlConnection conn = new SqlConnection();
conn.ConnectionString = @"Data Source=YAZEED-PC\YAZEED;Initial Catalog=ITS364_Project;Integrated Security=True";
String strSQL = "Select Project_ID,ProjectName from project";
SqlCommand command = new SqlCommand();
SqlDataReader dr;
try
{
conn.Open();
command.Connection = conn;
command.CommandText = strSQL;
dr = command.ExecuteReader();
while (dr.Read())
{
DataRow drr = dt.NewRow();
drr[0] = dr[0];
drr[1] = dr[1];
dt.Rows.Add(drr);
}
ds.Tables.Add(dt);
ddProj.DataValueField = "ProjectName";
ddProj.DataTextField = "Project_ID";
ddProj.DataSource = ds.Tables[0].DefaultView;
ddProj.DataBind();
txtProjName.Text = Convert.ToString(ddProj.SelectedItem.Value);
}
finally
{
conn.Close();
}
string strr = "Select Product_ID, Product_Name from Products";
try
{
conn.Open();
command.Connection = conn;
command.CommandText = strr;
dr = command.ExecuteReader();
while (dr.Read())
{
DataRow drr = dtProd.NewRow();
drr[0] = dr[0];
drr[1] = dr[1];
dtProd.Rows.Add(drr);
}
dsProd.Tables.Add(dtProd);
ddProd.DataValueField = "Product_ID";
ddProd.DataTextField = "Product_Name";
ddProd.DataSource = dsProd.Tables[0].DefaultView;
ddProd.DataBind();
if (ddProd.SelectedIndex != -1)
{
txtProdQuantity.Text = getQuan(Convert.ToInt32(ddProd.SelectedValue));
fillQtyCombo();
}
}
finally
{
conn.Close();
}
}
}
protected string getQuan(int val)
{
string str;
SqlConnection conn = new SqlConnection();
conn.ConnectionString = @"Data Source=YAZEED-PC\YAZEED;Initial Catalog=ITS364_Project;Integrated Security=True";
conn.Open();
String strSQL = "Select Product_Qty from Products where Product_ID = " + val + "";
SqlCommand command = new SqlCommand();
command.Connection = conn;
command.CommandText = strSQL;
str = Convert.ToString(command.ExecuteScalar());
return str;
}
protected void btnAssignProducts_Click(object sender, EventArgs e)
{
if (txtTaskName.Text == string.Empty)
{
msg.Text = "";
this.error.Text = "Please enter Task Name";
}
else if (ddProj.SelectedIndex == -1)
{
msg.Text = "";
this.error.Text = "Please Select Project";
}
else if (ddProd.SelectedIndex == -1)
{
msg.Text = "";
this.error.Text = "Please select Product";
}
else if (Convert.ToInt32(ddProdQuantity.SelectedValue) == 0)
{
msg.Text = "";
this.error.Text = "Please select Product Quantity ";
}
else
{
int rtn = 0;
SqlConnection conn = new SqlConnection();
conn.ConnectionString = @"Data Source=YAZEED-PC\YAZEED;Initial Catalog=ITS364_Project;Integrated Security=True";
conn.Open();
//String strSQL = "INSERT INTO Product_task (Project_ID,Product_ID,Product_Task_desc,Product_Task_Qty) values ("+ddProj.SelectedValue+","+ddProd.SelectedValue+",'"+txtTaskName.Text+"',"+ddProdQuantity.SelectedValue+")";
String strSQL = "INSERT INTO Product_task (Project_ID,Product_ID,Product_Task_desc) values (" + Convert.ToInt32(ddProj.SelectedItem.Text) + "," + ddProd.SelectedValue + ",'" + txtTaskName.Text + "')";
SqlCommand command = new SqlCommand();
command.Connection = conn;
command.CommandText = strSQL;
rtn = Convert.ToInt32(command.ExecuteNonQuery());
if (rtn > 0)
{
error.Text = "";
msg.Text = "Record Saved Successfully";
}
else
{
msg.Text = "";
error.Text = "Record Not saved Successfully, Kindly Try again.";
}
}
}
protected void ddProj_SelectedIndexChanged(object sender, EventArgs e)
{
txtProjName.Text = Convert.ToString(ddProj.SelectedItem.Value);
}
protected void ddProd_SelectedIndexChanged(object sender, EventArgs e)
{
if (ddProd.SelectedIndex != -1)
{
txtProdQuantity.Text = getQuan(Convert.ToInt32(ddProd.SelectedValue));
fillQtyCombo();
}
}
protected void fillQtyCombo()
{
if (ddProd.SelectedIndex != -1)
{
int val = Convert.ToInt32(getQuan(Convert.ToInt32(ddProd.SelectedValue)));
DataSet dsQty = new DataSet();
DataTable dtQty = new DataTable();
dtQty.Columns.Add("ID", Type.GetType("System.Int32"));
dtQty.Columns.Add("VAL", Type.GetType("System.String"));
for (int i = 1; val >= i; i++)
{
DataRow drr = dtQty.NewRow();
drr[0] = i;
drr[1] = i;
dtQty.Rows.Add(drr);
}
dsQty.Tables.Add(dtQty);
ddProdQuantity.DataValueField = "ID";
ddProdQuantity.DataTextField = "VAL";
ddProdQuantity.DataSource = dsQty.Tables[0].DefaultView;
ddProdQuantity.DataBind();
}
}
}
