Validating Textbox in signup page

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ASP.NET

How to validate textbox in asp.net using c# for checking the availability of user name from database without using ajax

Posted 20-Sep-11 23:01pm

Eshwar kumar

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3 solutions

Solution 2

You can use a custom validator something like..

<asp:TextBox ID="txtUsername" runat="server" />
<asp:CustomValidator ID="valUsernameExists" runat="server" ControlToValidate="txtUsername" ErrorMessage="Username already in use." Text="*" Display="Dynamic" OnServerValidate="valUsernameExists_ServerValidate" />

C#

protected void valUsernameExists_ServerValidate(object source, ServerValidateEventArgs args) {
           //code to check the username in database
        }

Posted 20-Sep-11 23:11pm

m@dhu

Solution 4

You try this for availability

Aspx page

XML

<body>
    <form id="form1" runat="server">
    <div>

        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1"
            ErrorMessage="*" Style="z-index: 100; left: 783px; position: absolute; top: 104px"></asp:RequiredFieldValidator>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="TextBox2"
            ErrorMessage="*" Style="z-index: 101; left: 785px; position: absolute; top: 157px"></asp:RequiredFieldValidator>
        &nbsp;&nbsp;
        <asp:Label ID="Label1" runat="server" Style="z-index: 102; left: 453px; position: absolute;
            top: 97px" Text="Username:"></asp:Label>
        <asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" Style="z-index: 103;
            left: 554px; position: absolute; top: 96px" TabIndex="1"></asp:TextBox>
        <asp:Label ID="Label2" runat="server" Style="z-index: 104; left: 479px; position: absolute;
            top: 156px" Text="Name:"></asp:Label>
        <asp:TextBox ID="TextBox2" runat="server" Style="z-index: 105; left: 553px; position: absolute;
            top: 155px" TabIndex="2"></asp:TextBox>
        <asp:Label ID="Label3" runat="server" Style="z-index: 106; left: 842px; position: absolute;
            top: 121px"></asp:Label>
        <asp:Button ID="Button1" runat="server" Style="z-index: 107; left: 602px; position: absolute;
            top: 219px" Text="Button" Width="54px" />
    <div id="checkusername" runat="server"  Visible="false">
        &nbsp;
        <asp:Label ID="lblStatus" runat="server" style="z-index: 108; left: 763px; position: absolute; top: 75px"></asp:Label>
        <asp:Image ID="imgstatus" runat="server" Width="20px" Height="20px" style="z-index: 109; left: 765px; position: absolute; top: 100px"/>
    </div>
        <asp:Image ID="Image1" runat="server" style="z-index: 111; left: 382px; position: absolute; top: 133px" ImageUrl="~/Images/LoadingImage.gif" Visible="False" />
    </div>
    </form>
</body>
</html>

Code behind...

 protected void Page_Load(object sender, EventArgs e)
        {
            
               if (!string.IsNullOrEmpty(TextBox1.Text))
            {
                SqlConnection con;
                SqlCommand cmd;
                string constr = ConfigurationManager.ConnectionStrings["SomeDataBase"].ToString();
                con = new SqlConnection(constr);

                cmd = new SqlCommand("Select * from Thi where Username=@Username", con);
                con.Open();
                cmd.Parameters.AddWithValue("@Username", TextBox1.Text);
                SqlDataReader dr = cmd.ExecuteReader();
                
                if (dr.HasRows)
                {
                    
                    checkusername.Visible = true;
                    imgstatus.ImageUrl = "Images/NotAvailable.jpg";
                    Label3.Text = "UserName Already Taken";
                    if (Label3.Text == "UserName Already Taken")
                    {
                        TextBox1.Text = " ";
                    }
                    System.Threading.Thread.Sleep(2000);
                }
                else
                {
                    checkusername.Visible = true;
                    imgstatus.ImageUrl = "Images/Icon_Available.gif";
                    Label3.Text = "UserName Available";
                    System.Threading.Thread.Sleep(1000);
                    con.Close();
                }

            }

            else
            {
                checkusername.Visible = false;
            }
}

I hope its help you... Happy coding.

Posted 21-Sep-11 1:34am

rkthiyagarajan

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Muralikrishna8811 · Accepted Answer · 2011-09-20T23:06:00

Hi,

Try this code in button click event.

C#

if (TextBox1.Text != null)
{
    SqlConnection con = new SqlConnection("");
    con.Open();
    SqlDataAdapter da = new SqlDataAdapter("select * from UserTab where username='"+TextBox1 .Text +"'", con);
    DataTable dt = new DataTable();
    da.Fill(dt);
    if (dt.Rows.Count > 0)
    {
        Label1.Text = "UserName already Exists in database";
    }
    else
    {
        Label1.Text = "Proceed to future steps";
    }
}

All the Best