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string autoHeader = dataGridView1.Columns[dataGridView1.CurrentCell.ColumnIndex].HeaderText;
SqlCommand comm = new SqlCommand("select distinct " + autoHeader + " from 领用表", conn);
string autoHeader = dataGridView1.Columns[dataGridView1.CurrentCell.ColumnIndex].HeaderText;
SqlCommand comm = new SqlCommand("select distinct @Header from 领用表", conn);
SqlParameter sp = new SqlParameter("@Header", autoHeader);
comm.Parameters.Add(sp);