Question

I am Executing One query using stored procedure object. i want to retreive number of rows returns in Select Statement after executing the query.

I am Confused between using ExecuteReader() & ExecuteScalar()

public static int getDuplicateEvent(string ATM, string Fault1, string Fault2, ref SqlConnection Connection)
{
    string sQuery = "";
    int result = 0;
    try
    {
        sQuery = /*Query With Format Select Code From A Union Select Code From B */
        using (SqlStoredProcedure sspObj = new SqlStoredProcedure(sQuery, Connection, CommandType.Text))
        {
            result = (int)sspObj.ExecuteScalar();
            sspObj.Dispose();
        }
    }
    catch (Exception xObj)
    {
        result = 0;
    }
    return result;
}

Answer 1

ExecuteScalar returns the first column of the first row of the results

ExecuteReader returns a datareader that can be iterated through

You could also use ExecuteNonQuery or Fill into a DataSet or DataTable

Assuming you want the rows and the count, I would fill a DataTable and count the rows using Rows.Count