Question

I have got a datalist with some databound fields with 2 buttons. I want to enable disable button depending on the column(state) value of each row, so for instance if the value of state is 0 , the remove button should be disable and add button should be enabled similarly when the value of state is 1 , vice versa..

protected void dlEditCaravans_ItemDataBound(object sender, DataListItemEventArgs e)
{
    Button addtoFeauture = e.Item.FindControl("btnAddToFeature") as Button;
    Button removetoFeauture = e.Item.FindControl("btnRemoveFeature") as Button;
    int id = Convert.ToInt32(dlEditCaravans.DataKeys[e.Item.ItemIndex]);
    int check = caravans.GetfeautureValue(id);

    if (check == 0)
    {
        addtoFeauture.Enabled = true;

    }

    else
    {
        removetoFeauture.Enabled = true;

    }

  }

I have tried something like above but it gives object reference not set to an instance error.

Answer 1

You need to use ItemDatabound event of Datalist

protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
{
 if ((e.Item.ItemType == ListItemType.Item) || (e.Item.ItemType == ListItemType.AlternatingItem))
    {
        DataRow dr = ((DataRowView)e.Item.DataItem).Row;
        if (Convert.ToBoolean(dr["StateColumnName"])
        {
          ((Button)e.Item.FindControl("Button1")).Enable = True;
        }
    }
}