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Editorial Team
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Asked: 2026-06-18T02:45:47+00:00

I have a tabcontainer with 3 panels and each one has a a few

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I have a tabcontainer with 3 panels and each one has a a few textboxes and a submit button. I want to store the values of textboxes in a variable on button click. I am getting null value exception at fname = txt.text;

Source:

       <body>
    <form id="form1" runat="server">
    <asp:ToolkitScriptManager ID="ToolkitScriptManager1"   runat="server">
        </asp:ToolkitScriptManager>
    <div>

        <asp:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="0" 
            style="margin-right: 38px"  Height="138px"  Width="402px">
            <asp:TabPanel runat="server" HeaderText="TabPanel1" ID="TabPanel1">

              <ContentTemplate>
<asp:UpdatePanel ID="updatePanel1" runat="server"><ContentTemplate><table><tr><td>First Name:</td><td><asp:TextBox ID="txtName" runat="server" /></td></tr><tr><td>Address:</td><td><asp:TextBox ID="txtAddress" runat="server" /></td></tr><tr><td><asp:Button ID="Button1" runat="server" Text="Submit" 
                                        onclick="Button1_Click1" /></td></tr></table></ContentTemplate></asp:UpdatePanel>
</ContentTemplate>

</asp:TabPanel>

            <asp:TabPanel ID="TabPanel2" runat="server" HeaderText="TabPanel2">
            <ContentTemplate>
                    Email: <asp:TextBox ID="txtEmail" runat="server" />


</ContentTemplate>

</asp:TabPanel>
            <asp:TabPanel ID="TabPanel3" runat="server" HeaderText="TabPanel3">
            <ContentTemplate>
                 <table>
               <tr> <td>User Name:</td><td><asp:TextBox ID="txtUser" runat="server" /></td></tr>
               <tr> <td>Password:</td><td><asp:TextBox ID="txtPass" runat="server" /></td></tr>

</ContentTemplate>

</asp:TabPanel>
        </asp:TabContainer>

    </div>
    </form>
</body>

 C# Code:



protected void Button1_Click1(object sender, EventArgs e)
{
    string fname = "";
    string address = "";
    Button btn = (Button)sender;

    TextBox txt = null;
    TextBox txt1 = null;


    txt = (TextBox)TabContainer1.Parent.FindControl("txtName");
    txt1 = (TextBox)TabContainer1.Parent.FindControl("txtAddress");
    fname = txt.Text;
    address = txt1.Text;
    DataTable dt = new DataTable();
    string q = "insert into tabtable (firstname,address) values('" + txt + "','" + txt1 + "')";
    dboperation dbo = new dboperation();
    dt = dbo.insert(q);
}
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1 Answer

  1. Editorial Team

    You should be able to reference this control directly since neither TabContainer nor TabPanel implements INamingContainer. Hence the TextBox is on top of the page:

    so instead of 

    txt = (TextBox)TabContainer1.Parent.FindControl("txtName");
fname = txt.Text;

    just

    fname = this.txtName.Text;
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