C#修改connectionStrings的方法

读取
 protected void Page_Load(object sender, EventArgs e)
 { 
     
 CheckLogin MyChk = new CheckLogin();
 title.InnerHtml = "<b>数据库连接配置</b>";


if (!IsPostBack)
 { 
     
 Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath);
string myConnect = config.ConnectionStrings.ConnectionStrings["MyApp.Properties.Settings.SqlConnectSetting"].ToString();

string[] arycon = myConnect.Split(';');
int i, li_index;
for (i = 0; i < arycon.Length; i++)
 { 
     
if (arycon[i].IndexOf("Data Source") > -1)
 { 
     
 li_index = arycon[i].IndexOf("=");
 TextBox1.Text = arycon[i].Substring(li_index + 1);
 }
if (arycon[i].IndexOf("Initial Catalog") > -1)
 { 
     
 li_index = arycon[i].IndexOf("=");
 TextBox2.Text = arycon[i].Substring(li_index + 1);
 }
if (arycon[i].IndexOf("User ID") > -1)
 { 
     
 li_index = arycon[i].IndexOf("=");
 TextBox3.Text = arycon[i].Substring(li_index + 1);
 }
if (arycon[i].IndexOf("Password") > -1)
 { 
     
 li_index = arycon[i].IndexOf("=");
 TextBox4.Text = arycon[i].Substring(li_index + 1);
 }
 }
 }
 }

修改
 protected void Button1_Click(object sender, EventArgs e)
 { 
     
string ls_newstring = "Data Source=" + TextBox1.Text.Trim() + ";Initial Catalog=" + TextBox2.Text.Trim() + ";Persist Security Info=True;User ID=" + TextBox3.Text.Trim() + ";Password=" + TextBox4.Text.Trim();

 Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath);
string csName = "MyApp.Properties.Settings.SqlConnectSetting";

 ConnectionStringsSection csSection = config.ConnectionStrings;
 csSection.ConnectionStrings[csName].ConnectionString = ls_newstring;

 config.Save(ConfigurationSaveMode.Modified);

 //IIS将重新启动
 }
 }