“SqlParameterCollection only accepts non-null SqlParameter type objects, not String objects”

Question

I keep getting the exception

The SqlParameterCollection only accepts non-null SqlParameter type objects, not String objects

, while execut

Answer 1

Try below

comm.Parameters.Add("@author", SqlDbType.VarChar);
comm.Parameters["@author"].Value = dataGridView1.Rows[i].Cells[0].Value.ToString();