Ask a data set filling problem (white)

在小学读高中

The value of Session ["shuihao"]. ToString () is not there, if it is, it should be correct.

bastard

If your Session["shuihao"] is null. You ToString() will definitely go wrong.

ds.Tables[0], the first table in the DataSet
sqlda.Fill(ds,"cheeck");--->cheeck is an alias, you are not wrong if you write, you can use the serial number when quoting

It is recommended that the landlord go to see some basic things