本文介绍了在服务器端验证的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在我的下面的代码中，每当我在密码文本框中输入值（即txtPassword）时，当我在下一个文本框中输入值时，该值将被删除。
我调试了我的代码但仍未获得错误。
In my following code whenever I am entering value in my password textbox (i.e txtPassword) the value gets erased when i my entering value in next textbox.
I debugged my code but still not getting the error.
protected void Page_Load(object sender, EventArgs e)
{
txtSecQue.Visible = false;
lblUser.Visible = false;
//txtUsername.Focus();
lblEmailID.Visible = false;
lblQue.Visible = false;
lblPassword.Visible = false;
}
protected void ddlSecQue_SelectedIndexChanged(object sender, EventArgs e)
{
if (ddlSecQue.SelectedItem.Text == "Other")
{
txtSecQue.Visible = true;
txtSecQue.Focus();
}
else if (ddlSecQue.SelectedItem.Text=="----Select----")
{
lblQue.Visible = true;
}
else
{
txtAnswer.Focus();
}
}
protected void txtUsername_TextChanged(object sender, EventArgs e)
{
//to check length of the string
string username=txtUsername.Text;
if (username.Length<5 || username.Length>15)
{
lblUser.Text = "Username must be between 5 to 15 characters";
lblUser.Visible = true;
txtUsername.Focus();
txtUsername.Text = "";
}
else
{
txtPassword.Focus();
}
string select = "Select * from Reg_Info where Username='"+txtUsername.Text+"'";
SqlCommand cmd = new SqlCommand(select, con);
SqlDataReader sdr;
con.Open();
sdr = cmd.ExecuteReader();
if (sdr.Read())
{
lblUser.Visible = true;
txtUsername.Text = "";
txtUsername.Focus();
}
else
{
txtPassword.Focus();
}
con.Close();
}
protected void txtEmailID_TextChanged(object sender, EventArgs e)
{
string select = "Select * from Reg_Info where EmailId='" + txtEmailID.Text + "'";
SqlCommand cmd = new SqlCommand(select, con);
SqlDataReader sdr;
con.Open();
sdr = cmd.ExecuteReader();
if (sdr.Read())
{
lblEmailID.Visible = true;
txtEmailID.Text = "";
txtEmailID.Focus();
}
con.Close();
}
protected void txtPassword_TextChanged(object sender, EventArgs e)
{
string password = txtPassword.Text;
if (password.Length<7 || password.Length>15)
{
lblPassword.Visible = true;
txtPassword.Text = "";
txtPassword.Focus();
}
else
{
txtRePassword.Focus();
}
}
<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Registeration.aspx.cs" Inherits="Registeration" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
<style type="text/css">
.style2
{
height: 23px;
}
.style3
{
height: 23px;
width: 252px;
}
.style4
{
width: 252px;
}
</style>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:TabContainer ID="TabContainer1" runat="server" Height="500" Width="1000"
ActiveTabIndex="0">
<asp:TabPanel ID="TabLogin" runat="server">
<HeaderTemplate>Login Details</HeaderTemplate>
<ContentTemplate><table class="style1"><tr><td class="style3">Username :</td><td class="style2"><asp:TextBox
ID="txtUsername" runat="server" AutoPostBack="True"
ontextchanged="txtUsername_TextChanged"></asp:TextBox> <asp:RequiredFieldValidator
ID="RequiredFieldValidator6" runat="server" ControlToValidate="txtUsername"
ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
<asp:Label ID="lblUser" runat="server" Text="Username already exist"></asp:Label>
</td></tr><tr><td class="style4">Password :</td><td><asp:TextBox ID="txtPassword"
runat="server" TextMode="Password" AutoPostBack="True"
ontextchanged="txtPassword_TextChanged"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ControlToValidate="txtPassword" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
<asp:Label ID="lblPassword" runat="server" Text="5 to 15"></asp:Label>
</td></tr><tr><td class="style4">Re-Type Password :</td><td><asp:TextBox ID="txtRePassword" runat="server" TextMode="Password"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
ControlToValidate="txtRePassword" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
<asp:CompareValidator ID="CompareValidator1" runat="server"
ControlToCompare="txtPassword" ControlToValidate="txtRePassword"
ErrorMessage="CompareValidator"></asp:CompareValidator>
</td></tr><tr><td class="style4">Email ID :</td><td><asp:TextBox
ID="txtEmailID" runat="server" Width="200px" AutoPostBack="True"
ontextchanged="txtEmailID_TextChanged"></asp:TextBox> <asp:RequiredFieldValidator
ID="RequiredFieldValidator4" runat="server" ControlToValidate="txtEmailID"
ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1"
runat="server" ControlToValidate="txtEmailID"
ErrorMessage="RegularExpressionValidator"
ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
<asp:Label ID="lblEmailID" runat="server" Text="EmailID already exist"></asp:Label>
</td></tr><tr><td class="style4">Security Question :</td><td><asp:DropDownList
ID="ddlSecQue" runat="server"
onselectedindexchanged="ddlSecQue_SelectedIndexChanged"
AutoPostBack="True" ><asp:ListItem>----Select----</asp:ListItem><asp:ListItem>Where you where born</asp:ListItem><asp:ListItem>What is your cousin name ?</asp:ListItem><asp:ListItem>What is your first grade teacher name ? </asp:ListItem><asp:ListItem>Other</asp:ListItem><asp:ListItem></asp:ListItem></asp:DropDownList> <asp:TextBox ID="txtSecQue" runat="server"></asp:TextBox> <asp:Label
ID="lblQue" runat="server" Text="Please Select one option"></asp:Label>
</td></tr><tr><td class="style4">Answer :</td><td><asp:TextBox ID="txtAnswer" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server"
ControlToValidate="txtAnswer" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
</td></tr><tr><td colspan="2"> <asp:Button ID="btnReg" runat="server" Text="Register" /> <asp:Button ID="btnCancel" runat="server" Text="Cancel" /></td></tr></table></ContentTemplate>
</asp:TabPanel>
<asp:TabPanel ID="TabPersonalInfo" runat="server">
<HeaderTemplate>Personal Information</HeaderTemplate>
<ContentTemplate><table class="style1"><tr><td>First Name :</td><td> </td></tr><tr><td>Last Name :</td><td> </td></tr><tr><td>Address Street1 :</td><td> </td></tr><tr><td>Address Street2 :</td><td> </td></tr><tr><td>City :</td><td> </td></tr><tr><td>State :</td><td> </td></tr><tr><td>Date of Birth :</td><td> </td></tr><tr><td>Mobile No :</td><td> </td></tr><tr><td>Alternate No :</td><td> </td></tr><tr><td>Gender :</td><td> </td></tr><tr><td
colspan="2"> <asp:Button ID="btnReg0" runat="server"
Text="Register" /> <asp:Button ID="btnCancel0" runat="server"
Text="Cancel" /></td></tr></table></ContentTemplate>
</asp:TabPanel>
</asp:TabContainer>
</asp:Content>
I am using autoPostback to check each textbox
Tell me where I am going wrong
Thank You
I am using autoPostback to check each textbox
Tell me where I am going wrong
Thank You
推荐答案
<asp:RegularExpressionValidator ID="revPassCheck" runat="server" ErrorMessage="Password lenght must be between 6 to 15 characters."
ControlToValidate="txtPassword" ValidationExpression="[\s\S]{7,15}"></asp:RegularExpressionValidator>这篇关于在服务器端验证的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！