Clarification on Exceuting SP in coding

exec spname '+ txt1.Text+','+ txt2.Text+'

SqlParameter[] param = new SqlParameter[1];
        param[0] = new SqlParameter("@value1", txt1.Text);
        param[1] = new SqlParameter("@value2", txt2.Text);
        DataTable objDataTable = new DataTable();
        SqlConnection objConnection = new SqlConnection(sConnString);
            objConnection.Open();
            SqlCommand objCommand = new SqlCommand("spname", objConnection) { CommandType = CommandType.StoredProcedure };
            objCommand.Parameters.AddRange(param);
            objCommand.CommandTimeout = 0;
            SqlDataAdapter objDataAdapter = new SqlDataAdapter(objCommand);
            objDataAdapter.Fill(objDataTable);