How to add Data in gridview from Dropdownlist ?

Question

I want to add data from dropdown list to gridview ,,,

here my code 

con.Open();
         SqlDataAdapter adpr1 = new SqlDataAdapter("select * from ItemMasterFile ", con);
         DataSet dspr1 = new DataSet();
         adpr1.Fill(dspr1);
         DropDownList1.DataSource = dspr1.Tables[0];
         DropDownList1.DataTextField = "Descriptionitem";
         DropDownList1.DataValueField = "Codeitem";
         DropDownList1.DataBind();

i want to insert Datatextfield and Datavalue into gridview...