Connection.Execute not working

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ASP.NET

can anybody please help me ----this is not returning anything

public static void PopulateCacheUserPercentageMarksForClass()
{
try
{
short? returnValue = 0;
string errMsg = "";
var param = new DynamicParameters();
param.Add("@Return", 0, direction: ParameterDirection.Output);
param.Add("@RetunErrMsg", string.Empty, direction: ParameterDirection.Output);
using (var connection = new SqlConnection(ConnectionManager.ConnectionString))
{
if (connection.State != ConnectionState.Open)
{
connection.Open();

}
connection.Execute("s_tidx_PopulateCacheUserPercentageMarksForClass", param, commandType: CommandType.StoredProcedure);
returnValue = param.Get<short?>("@Return");
errMsg = param.Get<string>("@RetunErrMsg");

}
}
catch (Exception ex)
{

}
}