I get the following error while setting an insert command onto my data adaptor (second line):
Object reference not set to an instance of an object.
adptr_DataAdapter1 = new SqlDataAdapter(str_SQL1, cnn_DataConnection1);
adptr_DataAdapter1.InsertCommand.CommandText = "INSERT INTO tbl_test (str_field1) VALUES('val1')";
Any idea why this is happening

Object reference not set to an instance of an object.
ed_narayanan
Create the SqlCommand object first:
SqlDataAdapter da = new SqlDataAdapter();
// Create the InsertCommand. There are many ways to do this...
da.InsertCommand = cnn_DataConnection1.CreateCommand();
da.InsertCommand.InsertCommand = "INSERT INTO Customers (CustomerID) VALUES ('val1')";