<connectionstrings>
     <add name="MyDBConnectionString" providername="System.Data.SqlClient">
           connectionString="Data Source=localhost;Initial Catalog=MySQLServerDB; Integrated Security=true" />
  </add></connectionstrings>

然后在c#

Then in c#

SqlConnection conn = new SqlConnection();
conn.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MyDBConnectionString"].ConnectionString;

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您需要在项目中具有app.config，其余部分与web.config中的相同.

You need to have app.config in the project, and rest of the part remains same as in web.config.

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <connectionStrings>
    <add name="DBEntities" connectionString="metadata=res://*/TestModel.csdl|res://*/TestModel.ssdl|res://*/TestModel.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=127.0.0.1\Dev;Initial Catalog=TestDB;User ID=TestUser;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>
</configuration>

在Windows应用程序中，我们有app.config文件，将以下代码添加到该xml文件中

<connectionstrings>
      <add name="MyConnectionString" providername="System.Data.SqlClient">
            connectionString="Data Source=localhost;Initial Catalog=MySQLServerDB; Integrated Security=true" />
  </add></connectionstrings>  

要从form.cs访问它，请编写与Web应用程序.aspx.cs页面相同的代码，如下所示

To access it from form.cs write the same code as web applications .aspx.cs page as following

SqlConnection conn = new SqlConnection();
conn.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;

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