C# how to write to achieve so that a TextBox text box allows you to enter English characters only example source code download, but can not enter numbers and Chinese do? Perhaps through this source code examples you will find the answer, you can test the next, as shown in the screenshot in the window, enter the letters only when it is useful

EnglishTextBox
EnglishTextBox.sln
EnglishTextBox.suo
..............\EnglishTextBox.csproj
..............\E_TextBox.cs
..............\E_TextBox.Designer.cs
..............\E_TextBox.resx
..............\Form1.cs
..............\Form1.Designer.cs
..............\Form1.resx
..............\Program.cs
..............\Properties
..............\..........\AssemblyInfo.cs
..............\..........\Resources.Designer.cs
..............\..........\Resources.resx
..............\..........\Settings.Designer.cs
..............\..........\Settings.settings

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