in gridview there are 2 dropdown 2 dropdown is dependent on first.

Question

After selecting the ddlprogram it should display the ddl_Location where the programs are avaliable aspx file Select Program SetFocusOnError="True" ValidationGroup="v1" ForeColor="Red" InitialValue="0"> Select Location SetFocusOnError="True" ValidationGroup="v1" ForeColor="Red" InitialValue="0"> aspx.cs protected void gvProgram_RowDataBound(object sender, GridViewRowEventArgs e) { DataSet ds = new DataSet(); Btech.Mode = "BindData"; ds = objDal.Adm(Btech); if (e.Row.RowType == DataControlRowType.DataRow) { if (ds.Tables[0].Rows.Count > 0 && ds.Tables[1].Rows.Count > 0) { DropDownList ddlProgram = (DropDownList)e.Row.FindControl("ddlProgram"); ddlProgram.Items.Clear(); ddlProgram.DataSource = ds.Tables[13]; ddlProgram.DataTextField = "Description"; ddlProgram.DataValueField = "CourseID"; ddlProgram.DataBind(); ddlProgram.Items.Insert(0, new ListItem("Select course", "0")); DropDownList ddl_Location = (DropDownList)e.Row.FindControl("ddl_Location"); //ddlTeacherNames.Items.Clear(); ddl_Location.DataSource = ds.Tables[14]; ddl_Location.DataTextField = "CenterName"; ddl_Location.DataValueField = "CentreCode"; ddl_Location.DataBind(); ddl_Location.Items.Insert(0, new ListItem("Select Location", "0")); } } } protected void ddlProgram_SelectedIndexChanged(object sender, EventArgs e) { }

Naimish Makwana · Answer

It seems like you want to populate the ddl_Location dropdown based on the selected value of the ddlProgram dropdown. You can achieve this by fetching the relevant data inside the ddlProgram_SelectedIndexChanged event. Here is a sample code snippet: protected void ddlProgram_SelectedIndexChanged(object sender, EventArgs e) { // Get the selected program DropDownList ddlProgram = (DropDownList)sender; string selectedProgram = ddlProgram.SelectedValue; // Find the ddl_Location control GridViewRow row = (GridViewRow)ddlProgram.NamingContainer; DropDownList ddl_Location = (DropDownList)row.FindControl("ddl_Location"); // Fetch the locations based on the selected program // This is just a placeholder, replace it with your actual data fetching logic DataSet dsLocations = FetchLocationsForProgram(selectedProgram); // Bind the fetched data to ddl_Location ddl_Location.DataSource = dsLocations; ddl_Location.DataTextField = "CenterName"; ddl_Location.DataValueField = "CentreCode"; ddl_Location.DataBind(); ddl_Location.Items.Insert(0, new ListItem("Select Location", "0")); } In this code, FetchLocationsForProgram(selectedProgram) is a placeholder method which you should replace with your actual logic to fetch the locations based on the selected program. This method should return a DataSet or DataTable which can be bound to ddl_Location . Please replace the placeholder method with your actual data fetching logic. Thanks.