读取连接字符串

using System.Configuration;

this.cboxConn.Text.Trim() /// string getValue

class DbConnection
{

private static string currentConnectionString = ConfigurationManager.ConnectionStrings["SalaryManager.Properties.Settings.severConnection"].ConnectionString;
private static string loginConnectionStr = "数据库服务器";

public static string returnConnectionStr()
{
return loginConnectionStr;
}

public static string isServerConnection(string getValue )
{
if (getValue == "数据库服务器")
{
currentConnectionString = ConfigurationManager.ConnectionStrings["SalaryManager.Properties.Settings.severConnection"].ConnectionString;
}
else
{
currentConnectionString = ConfigurationManager.ConnectionStrings["SalaryManager.Properties.Settings.localConnection"].ConnectionString;
}
loginConnectionStr = getValue;
return currentConnectionString;
}

public static SqlConnection createConn()
{
SqlConnection thisConnection = new SqlConnection(currentConnectionString);
return thisConnection;

}