Copying one datatable to another datatable c#

Question

I have one datatable called dt which has columns like date ,name,subject . I want to copy part of this dt to another datatable dt3 using where condition.

foreach (DataRow row in dt.Rows)
{
      cellData =(DateTime)row["date"];
      dt3 =  dt.AsEnumerable()
               .Where (rows =>rows.Field<DateTime>("date")== cellData )
               .CopyToDataTable();
}

I am trying this ,but its giving exception. Please give a solution for this or else how to use by select query

Answer 1

You are trying to filter your table from each row. This is not correct and will create a datatable for every row.

If you want to filter your dataTable, you can use dt.Select() or use Linq :

var dateFilter = DateTime.Parse("1/1/2015");
var dt3 = dt.AsEnumerable().Where(x => x.Field<DateTime>("date") == dateFilter).CopyToDataTable();

Please provide more explanation if that's not exactly what you want to perform.

Answer 2

Datatable dt may have rows which has null values for column date

Use nullable DateTime while comparing date

 dt3 = dt.AsEnumerable()
              .Where(rows => rows.Field<DateTime?>("date") == cellData )
              .CopyToDataTable();