protected void ddlTT1_SelectedIndexChanged(object sender, EventArgs e)
        {
            string    ActivityID = DetailsView1.DataKey.Value.ToString();
            string    TT1        = "SELECT TeamMembers.V_ID, V_Name, V_LastName,V_MobileNo1, V_MobileNo2,V_Email ,TP_Name  FROM TeamMembers,TeamPositions,Volunteer WHERE TeamMembers.TT_ID = 4 AND TeamMembers.V_ID = Volunteer.V_ID and TeamMembers.TP_ID = TeamPositions.TP_ID AND  TeamMembers.V_ID NOT IN (SELECT VolunteerJoinActivities.V_ID FROM VolunteerJoinActivities WHERE Activity_ID = " + ActivityID + "); ";
            DataTable dtTT1      = dbconn.QueryExecuteScalar(TT1);

            GridViewTT1.DataSource = dtTT1;
            GridViewTT1.DataBind();
            dbconn.Close();
            lblTT2.Text = GridViewTT1.Rows.Count.ToString();
        }
        protected void SaveTT2_Click(object sender, EventArgs e)
        {
            CheckBox chkbox = new CheckBox();

            foreach (GridViewRow grdRow in GridViewTT1.Rows)
            {
                chkbox = (CheckBox)Convert.ChangeType(((CheckBox)grdRow.FindControl("chk")), typeof(CheckBox));
                if (chkbox.Checked)
                {
                    string keyID = (string)GridViewTT1.DataKeys[grdRow.RowIndex].Value.ToString();
                    string sqlSelectVolunteer = "Insert into VolunteerJoinActivities(V_ID,VJA_Status,Activity_ID) Values (" + keyID + ",'Selected'," + DetailsView1.SelectedValue + ") ;";
                    dbconn.QueryExecuteScalar(sqlSelectVolunteer);
                }
            }
            dbconn.Close();
            GridViewTT1.DataBind();
        }