private void ebutton_Click(object sender, EventArgs e) { sqlConnection.Open(); String sqlcmdstr = "SELECT * FROM [dba].[eigenvaluetable] where ID = '" + sensordata[0] + "'"; SqlCommand sqlcmd = new SqlCommand(sqlcmdstr, sqlConnection); SqlDataAdapter sda = new SqlDataAdapter(sqlcmd); DataSet ds = new DataSet(); sda.Fill(ds); eigenvalueform ef = new eigenvalueform(ds); ef.ShowDialog(); sqlConnection.Close(); }