c# adding row to datatable which has an auto increment column

Do this way. Reference link

DataColumn column = new DataColumn();
column.DataType = System.Type.GetType("System.Int32");
column.AutoIncrement = true;
column.AutoIncrementSeed = 1;
column.AutoIncrementStep = 1;

// Add the column to a new DataTable.
DataTable table = new DataTable("table");
table.Columns.Add(column);

DataRow oRow = table.NewRow();
table.Rows.Add(oRow);

Try one of the these two:

1. Set field values:

   row.A = null;
   row.B = 1;
   row.C = 3;
   

2. Add row to DataTable:

   dtA.Rows.Add(null,1,2);
   

They are both the same just try any of them and it should get you going. Also remember that whenever you want to make a column auto-increment in DataTable then you have to insert null into it.

Open the designer of the dataset xsd file and set the AutoIncrement, AutoIncrementSeed and AutoIncrementStep property of the column A in datatable for an existing column.