Dear sir,
I tried your provided code. but in the productdetails page are one error. from product page has goes to productdetails page
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
id = Convert.ToInt32(Request.QueryString["itemid"]);
DataTable dt = GetData(id);
if (Session["Data"] != null)
{
DataTable dx = (DataTable)Session["Data"];
dx.Merge(dt);
Session["Data"] = dx;
GridView1.DataSource = dx;
GridView1.DataBind();
}
else
{
Session["Data"] = dt;
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
private DataTable GetData(int id)
{
string conString = ConfigurationManager.ConnectionStrings["constring"].ConnectionString;
string a = "select itemname,image,price,obqty from tbproduct where id='" + @id + "'";
SqlCommand cmd = new SqlCommand(a);
using (SqlConnection con = new SqlConnection())
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.Connection = con;
cmd.Parameters.AddWithValue("@id", id);
sda.SelectCommand = cmd;
using (DataTable dt = new DataTable())
{
sda.Fill(dt);
return dt;
}
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("Products.aspx");
}
error are below
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 134: {
Line 135:
Line 136: string conString = ConfigurationManager.ConnectionStrings["constring"].ConnectionString;
Line 137: string a = "select itemname,image,price,obqty from tbproduct where id='" + @id + "'";
Line 138: SqlCommand cmd = new SqlCommand(a);
Source File: C:\Users\Dell Vostro\Documents\Visual Studio 2010\Projects\VMOSW\VMOSW\User\Productdetails.aspx.cs Line: 136
Stack Trace:
