How to sort my alphanumeric data in datagridview column?

If your DataGridView is bound to a DataTable, then one thing you could do would be to add a 'calculated' column to the DataTable and then sort on that. After binding, you can then hide this column in the DGV.

Suppose the DataTable is 'dt' and the column which contains the i1, i2 etc. is called 'ID'. The code to bind the DataTable would then need to be altered as follows:

DataColumn dc = dt.Columns.Add("Sort", typeof(int));

dc.Expression = "Convert(Substring(ID, 2, Len(ID) - 1), 'System.Int32')";

DataView dv = dt.DefaultView;

dv.Sort = "Sort";

dataGridView1.DataSource = dv;

dataGridView1.Columns["Sort"].Visible = false;