Trace my mistake in this Code Snippet in C#?

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C#

C#4.0

Here I just want to use the switch case instead of commented lines
if the defualt value is an integer. So here my code is not working. Please trace my mistake.

ParameterInfo[] pif = m.GetParameters();
foreach (ParameterInfo p in pif)
{
    string ParamType = p.ParameterType.ToString();
    string ConvPType = ConvertToShortForm(ParamType);
    if (p.IsOut)
    {
        ConvPType = ConvPType.Replace("ref", "out");
    }
    strMethodName += ConvPType;
    strMethodName += " ";
    strMethodName += p.Name;

    if (p.IsOptional)
    {
        var optional_value = p.DefaultValue;
        switch (optional_value)
        {
            case "":
                strMethodName += @"""" + @"""";
                break;
            case null:
                strMethodName = strMethodName + "=" + "null";
                break;
            case "False":
                strMethodName += " = " + p.DefaultValue.ToString().ToLower();
                break;
            default: strMethodName += ", ";
                break;
        }

//if (p.DefaultValue != null)
//    strMethodName += " = " + p.DefaultValue.ToString().ToLower();
//if (p.DefaultValue == null)
//    strMethodName = strMethodName + "=" + "null";
//if (strMethodName.EndsWith("= "))
//    strMethodName += @"""" + @"""";