Question

Here i have tried to do bind the gridview as per the selection in the checkboxlist.
I’m getting only blank page when its executed. can any one specify what’s the mistake?

protected void Button1_Click(object sender, EventArgs e)
{
String query = "Select Proj_id,Proj_name,Front_end,Back_end from Proj_details where Front_end = 'Android'";
String[] frontend ={ "Android", "Asp", "Asp.net", "C#.net", "J2EE", "Java", "Matlab", "NS2", "PHP", "VB", "VB.net" };
try
{
for (int i = 0; i <= CheckBoxList1.Items.Count; i++)
{
if (CheckBoxList1.Items[i].Selected)
query = query.Insert(query.Length, frontend[i] + "','");
}

con.Open();
query = query.Remove(query.Length - 1);
query = query.Remove(query.Length - 1);
query = query.Insert(query.Length, ")");
SqlDataAdapter sqlada = new SqlDataAdapter(query, con);
DataSet ds = new DataSet();
sqlada.Fill(ds, "Proj_details");


gv_search_project.DataSource = ds.Tables[0];
gv_search_project.DataBind();



}
catch (Exception ex)
{

}
finally
{

Label1.Text = query.ToString();
}

} 

Answer 1

You’re going out of the array here:

for (int i = 0; i <= CheckBoxList1.Items.Count; i++)
{
   if (CheckBoxList1.Items[i].Selected)
      query = query.Insert(query.Length, frontend[i] + "','");
}

You need to replace:

i <= CheckBoxList1.Items.Count

With:

i < CheckBoxList1.Items.Count