C/C++ :: Insert Values Into MSI Database (Registry Table)

Am using the below code to INSERT values into MSI Database (Registry table)

private void button2_Click(object sender, EventArgs e) {
String Name1 = lblDName.Name;
String Value1 = txtDName.Text;

String Name2 = lblUnisntall.Name
String Value2 = txtUninstall.Text;

[Code] ....

This code work properly, but after inserting values in MSI database.

The Value1 and value 2 are created as REG_SZ (String) but as per my requirement,

Value1, should be REG_EXPAND_SZ
Value 2, should be REG_DWORD

Need to convert them in my code and then to insert into the MSI database.