Question

I would like to know which values are null in datatable in c# that is returned from ExecuteDataTable of SqlHelper class.

string select = "select * from testTable";
string val="";

DataTable  dt=dbcon.ExecuteDataTable(select);
foreach (DataRow dr in dt.Rows)
{
   foreach (DataColumn  dc in dt.Columns )
   {
       if(dr[dc].Equals (null))
       {
          val ="null";
       } 
       else  
       {
          val = dr[dc].ToString();
       }
   }
}

But unfortunately I didn’t find any way to do it. Please let me know if there is a way. Thank you in advance.

Answer 1

As well as David M’s method, you can also use DataRow.IsNull:

if (dr.IsNull(dc))