C#如何实现"点击登陆框上的确定按钮,然后进入主界面"

首先要做用户判断.如果用户存在且用户输入的密码与数据库中的密码匹配,那么就转到主截面.否则提示用户名无效或密码错误.
我这里提供代码.你看一下.
界面上的控件ID要和程序代码中的一致.你在做界面的时候跟据我提供的代码适当的更改.
代码里面用到了我自己写的2个类.分别是UserInfor , 和DataBase
最后，在web.config中增加如下代码：

<appSettings>
<add key="DBConn" value="Data Source=.;Initial Catalog=KeepSecretSys;User ID=sa;Password=guogzliye8411!#"/>
</appSettings>
这段代码是数据库的连接配置，你跟据自己的连接情况，稍做更改
点击确定按钮的代码如下:
//获取用户在页面上的输入
string userLoginName = this.TextBox_Account.Text; //用户登录名
string password = TextBox_Password.Text; //密码
UserInfor user = new UserInfor(); //实例化User类
user.LoadData(userLoginName); //利用User类的LoadData方法，获取用户信息

if (user.Exist) //如果用户存在
{
if (user.Password == password) //如果密码，转入留言列表页面
{
Session.Add("UserID", user.UserID);//使用Session来保存用户登录名信息
Response.Redirect("Index.aspx");

}
else //如果密码错误，给出提示，光标停留在密码框中
{
Response.Write("<Script Language=JavaScript>alert(\"密码错误，请重新输入密码！\")</Script>");
}
}
else //如果用户不存在
{
Response.Write("<Script Language=JavaScript>alert(\"对不起，用户不存在！\")</Script>");
}

UserInfor的代码如下（你在项目中建一个类取名为UserInfor）：
#region 私有成员

private string _UserID; //用户ID
private string _Account; //用户登录名
private string _UserName; //用户姓名
private string _Password; //用户密码
//private string _UserSex; //用户地址
//private string _UserMail; //用户主页
//private string _UserInternet; //用户Email
//private string _UserSAP; //用户地址
//private string _UserUnitID; //用户Unit
private string _UserAvail; //用户Email
private DateTime _DateTimeFrom; //员工当前组织单元的起始时间
private DateTime _DateTimeEnd; //员工当前组织单元的终止时间
private ArrayList _DutyPage = new ArrayList(); //用户所有的权限
private ArrayList _DutyNode = new ArrayList(); //用户所有的权限
private string _RoleName;
private bool _UpLoad;
private bool _EnterData;
//private static string DBconnString;
private bool _exist; //是否存在标志

#endregion 私有成员

#region 属性

public string UserID
{
set
{
this._UserID = value;
}
get
{
return this._UserID;
}
}
public string RoleName
{
set
{
this._RoleName = value;
}
get
{
return this._RoleName;
}
}
public ArrayList DutyPage
{
set
{
this._DutyPage = value;
}
get
{
return this._DutyPage;
}
}
public ArrayList DutyNode
{
set
{
this._DutyNode = value;
}
get
{
return this._DutyNode;
}
}
public string Account
{
set
{
this._Account = value;
}
get
{
return this._Account;
}
}
public string UserName
{
set
{
this._UserName = value;
}
get
{
return this._UserName;
}
}
public string Password
{
set
{
this._Password = value;
}
get
{
return this._Password;
}
}

public string UserAvail
{
set
{
this._UserAvail = value;
}
get
{
return this._UserAvail;
}
}
public DateTime DateTimeFrom
{
set
{
this._DateTimeFrom = value;
}
get
{
return this._DateTimeFrom;
}
}
public DateTime DateTimeEnd
{
set
{
this._DateTimeEnd = value;
}
get
{
return this._DateTimeEnd;
}
}
public bool UpLoad
{
set
{
this._UpLoad = value;
}
get
{
return this._UpLoad;
}
}

public bool EnterData
{
set
{
this._EnterData = value;
}
get
{
return this._EnterData;
}
}

public bool Exist
{
get
{
return this._exist;
}
}

#endregion 属性

#region 方法

/// <summary>
/// 根据参数用户帐号，获取用户详细信息
/// </summary>
/// <param name="loginName">用户登录名</param>
public void LoadData(string loginName)
{
DataBase db = new DataBase(); //实例化一个DataBase类

string Sql = "";
Sql = "Select * from UserInfor where UserAvail = 1 and Account = "
+ SqlStringFormat.GetQuotedString(loginName);

DataRow dr = db.GetDataRow(Sql); //利用DataBase类的GetDataRow方法查询用户数据

//根据查询得到的数据，对成员赋值
if (dr != null)
{

this._UserID = GetSafeData.ValidateDataRow_S(dr, "UserID");
this._Account = GetSafeData.ValidateDataRow_S(dr, "Account");
this._UserName = GetSafeData.ValidateDataRow_S(dr, "UserName");
this._Password = GetSafeData.ValidateDataRow_S(dr, "Password");
//this._UserSex = GetSafeData.ValidateDataRow_S(dr, "UserSex");
//this._UserMail = GetSafeData.ValidateDataRow_S(dr, "UserMail");
//this._UserInternet = GetSafeData.ValidateDataRow_S(dr, "UserInternet");
//this._UserSAP = GetSafeData.ValidateDataRow_S(dr, "UserSAP");
//this._UserUnitID = GetSafeData.ValidateDataRow_S(dr, "UserUnitID");
this._UserAvail = GetSafeData.ValidateDataRow_S(dr, "UserAvail");
this._DateTimeFrom = GetSafeData.ValidateDataRow_T(dr, "DateTimeFrom");
this._DateTimeEnd = GetSafeData.ValidateDataRow_T(dr, "DateTimeEnd");
this._RoleName = GetSafeData.ValidateDataRow_S(dr, "RoleName");
this._exist = true;
}
else
{
this._exist = false;
}
}
//------UserInfor代码完

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