问在SQL表中，我得到最后一列的最后一行值

EN

int totalRows = dtable.Rows.Count;
int totalCols = dtable.Columns.Count;

string value = dtable.Rows[totalRows-1][totalCols-1].ToString();

TextBox2.Text=value;

col1 | col2 | col3
 1      abc    pqr
 2      art    lmn
 3      yut    xyz
 4      btt    vgt

  string query = " select top 1 youlastcolumnname   from 
      FROM youtable ORDER BY youruniqueid desc";

 using (System.Data.SqlClient.SqlConnection conn = new System.Data.SqlClient.SqlConnection(yourconnectionstring))
            {
                conn.Open();
                System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(query , conn);
                cmd.CommandType = System.Data.CommandType.Text;
                youttextbox.Text = cmd.ExecuteScalar().ToString();
                conn.Close();
            }