Note reload visual when add exists file to project

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C#

.NET

WinForms

Hi every body,
I have a function

public void H_addform()
{
    Microsoft.Build.BuildEngine.Project proj = new Microsoft.Build.BuildEngine.Project();
    string projFileName = "../../Auto_Source.csproj";
    proj.Load(projFileName);
    proj.AddNewItem("Compile", "SampleCode.cs");
    //proj.a
    proj.Save(projFileName);

}

When i call this function visual have warning source has modifires, require i reload. How to automatically reload by code? Not use Environment > Document > Auto-Load Changes, if save....
Thank so much,