Question

why this code is not working ….

I want to binding the combo box with names coming from database table like this

      private void getcategories()
      {
        var category = (from categories in tgs.categories
                        select categories.category_Name).ToList();
        categoryCombobox.DataSource = category;

      }

        private void categoryCombobox_SelectedIndexChanged(object sender, EventArgs e)
       {
        getcategories();
      } 

am i doing any thing wrong for binding the details to combobox
any suggestions pls that would be helpful to me

Answer 1

private void getcategories()
{
    var category = (from categories in tgs.categories
                        select categories.category_Name).ToList();
    categoryCombobox.DataSource = category;

    categoryCombobox.DataBind(); //dont forget this

}

edit – just as a small general criticism, your method is named poorly. I would do something more like:

private IEnumerable<string> Getcategories()
{
    return categproes.Select(c=>c.category_Name);
}

private void BindCategories()
{
    categoryCombobox.DataSource = this.GetCategories();
    categoryCombobox.DataBind();
}

private void categoryCombobox_SelectedIndexChanged(object sender, EventArgs e)
{
    BindCategories();
}