insert item in combobox after binding it from a Dataset in c#

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You have to Insert to the object you are databinding to rather than to the combobox. You can’t insert directly into the combobox.

You can use this:

DataTable dt = new DataTable();

dt.Columns.Add("ID", typeof(int));
dt.Columns.Add("CategoryName");

DataRow dr = dt.NewRow();
dr["CategoryName"] = "Select";
dr["ID"] = 0;

dt.Rows.InsertAt(dr, 0);

cmbCategory.DisplayMember = "CategoryName";
cmbCategory.ValueMember = "ID";
cmbCategory.DataSource = dt;
cmbCategory.SelectedIndex = 0;

This is very straight forward example.

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