Thanx Dear..... It is working..!!

But tell me what is the difference between these two blocks

yours...

txtFName.Text = arr[0].ToString();
        txtLName.Text = arr[1].ToString();
        txtDesignation.Text = arr[2].ToString();
        txtEmail.Text = arr[3].ToString();
        txtFaxno.Text = arr[4].ToString();
        txtMobileNo.Text = arr[5].ToString();
        txtPin.Text = arr[6].ToString();
        txtPhone.Text = arr[7].ToString();
        ddlTitle.SelectedIndex = ddlTitle.Items.IndexOf(ddlTitle.Items.FindByText(arr[8].ToString()));

        if (arr.Count > 9 && arr[9].ToString() != string.Empty)
        {
            RadioButtonList1.SelectedIndex = RadioButtonList1.Items.IndexOf(RadioButtonList1.Items.FindByText(arr[9].ToString()));
        }

Mine 

txtFName.Text = arr[0].ToString();
        txtLName.Text = arr[1].ToString();
        txtDesignation.Text = arr[2].ToString();
        txtEmail.Text = arr[3].ToString();
        txtFaxno.Text = arr[4].ToString();
        txtMobileNo.Text = arr[5].ToString();
        txtPin.Text = arr[6].ToString();
        txtPhone.Text = arr[7].ToString();
        ddlTitle.SelectedIndex = ddlTitle.Items.IndexOf(ddlTitle.Items.FindByText(arr[8].ToString()));

        if (arr[9].ToString() != string.Empty)
        {
            RadioButtonList1.SelectedIndex = RadioButtonList1.Items.IndexOf(RadioButtonList1.Items.FindByText(arr[9].ToString()));
        } 

I am not using thsi arr.Count > 9 &&  

why should I check . If they are greater than 9 so they are if not then they are not ..

after all this code should work...!

thanx