在c#项目中连接sql数据库

1.

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    
        <connectionStrings>
            <add name="keys" connectionString="Data Source={0};uid={2};pwd={3};Initial Catalog={1};" providerName="System.Data.SqlClient;pooling=true;Max Pool Size=1000;Min Pool Size=30;Connect Timeout=1000"/>
            <add name="LBDatabaseEntities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=WIN-NRF4E4F71BM;initial catalog=LBDatabase;user id=sa;password=sa.123456;MultipleActiveResultSets=True;Connect Timeout=2000;App=EntityFramework&quot;" providerName="System.Data.EntityClient"/>
        </connectionStrings>

<startup> 
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
</startup>
</configuration>

WIN-NRF4E4F71BM 电脑名称（或者服务器实列名称）

LBDatabase  是数据库名称
sa 是数据库账号
sa.123456 是数据库密码