Converting Reg_SZ values to REG_EXPAND_SZ and REG_DWORD values

private void button2_Click(object sender, EventArgs e)
        {            
            String Name1 = lblDName.Name;
            String Value1 = txtDName.Text;
            
            String Name2 = lblUnisntall.Name
            String Value2 = txtUninstall.Text;

            // query the database
            WindowsInstaller.View view = instDb.OpenView("INSERT INTO Registry (Name, Value) VALUES ('" + Name1 + "', '" + Value1 + "')");

            view.Execute(null);
        }

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 

Could you please help me in converting them in my code and then to insert into the MSI database.

Cheers,