Question

I have a ASP.NET GridView that uses template columns and user controls to allow me to dynamically construct the datagrid. Now I’m implementing the event handler for inserting a row. To do that, I create an array of default values and add it to the data table which is acting as a data source. However, when my OnLoad event is fired on postback, all my template columns no longer have the user controls. My gridview ends up just being all blank with nothing in it and my button column disappears as well (which contains the add row, delete row and save buttons).

My row add event just does this:

    public void AddDataGridRow()     {         List<object> defRow = new List<object>();          for (int i = 0; i < fieldNames.Count; i++)         {             defRow.Add(GetDefaultValueFromDBType(types[i]));            }          dt.Rows.Add(defRow);     } 

It is fired from a button in a user control that’s implement like this:

    protected void Button1_Click(object sender, EventArgs e)     {         ((Scoresheet)(this.Page)).AddDataGridRow();     } 

My on load event does a bunch of stuff on first run to set the GridView up but I don’t run that again by using the IsPostBack property to tell.

    protected void Page_Load(object sender, EventArgs e)     {         if (!IsPostBack)             Initialize();     } 

Anyone have any hints as to why my user controls are vanishing?

Answer 1

You have to add the controls to the grid on every page_load, not just if it’s (!Postback)