How Can I Fix Blurry Text in My Windows Forms Application at High DPI Settings?

Sharp Text Rendering in High-DPI Windows Forms Applications

High DPI settings (150% and above) can cause blurry text in Windows Forms applications due to Windows' default scaling mechanism. To achieve clear text rendering, your application must explicitly declare its high-DPI compatibility. This is done by modifying the application manifest or using a P/Invoke call.

Method 1: Modifying the Application Manifest

1. Add a new "Application Manifest File" to your project.
2. Replace the contents with the following XML:

<code class="language-xml"><?xml version="1.0" encoding="utf-8"?>
<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
  <assemblyIdentity name="MyApplication.app" version="1.0.0.0" />
  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
    <security>
      <requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
        <requestedExecutionLevel level="asInvoker" uiAccess="false" />
      </requestedPrivileges>
    </security>
  </trustInfo>
  <application>
    <windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
      <dpiAware>true</dpiAware>
    </windowsSettings>
  </application>
</assembly></code>

Method 2: Using P/Invoke for ClickOnce Deployments

For ClickOnce deployments, add the following code to your Main() method:

<code class="language-csharp">[STAThread]
static void Main() {
    if (Environment.OSVersion.Version.Major >= 6) SetProcessDPIAware();
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);
    Application.Run(new Form1()); // Adjust as needed
}

[System.Runtime.InteropServices.DllImport("user32.dll")]
private static extern bool SetProcessDPIAware();</code>

By implementing either method, your application will correctly handle high-DPI scaling, ensuring sharp text display on high-resolution screens.

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