How to get SQL result saved into a C# variable?

Question

I have troubles finding out how to save an SQL result into a String or whatever type the result returns.

My SQL query is:

SELECT SUM(Length) FROM tbl_tes         


        

Answer 1

You can use SqlDataReader . Here is a sample :

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbConnectionString"].ToString());


SqlCommand read_command = new SqlCommand("SELECT SUM(Length) FROM tbl_test WHERE TITLE LIKE '@t%'", con);
        read_command.Parameters.Add("@t", SqlDbType.NVarChar).Value = Str;
        SqlDataReader read_rd;
        string SUM ;
        try
        {
            con.Open();
            read_rd = read_command.ExecuteReader();
            if (read_pass_rd.HasRows)
            {
                while (read_rd.Read())
                {
                    SUM = read_rd.GetString(0);
                }
            }
            read_rd.Close();
            con.Close();
        }
        catch (Exception)
        {
            if (con.State == ConnectionState.Open)
                con.Close();
        }

and the 'Str' is a string is the string that you search for, and 'SUM' string is the answer.