Control id could not found in update panel

Question

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I have two text box named as rate and quantity inside a grid view as item template.when i change the rate and quantity value then total amount field must be updated but when i am trying to do that by using update panel i got a error.

ASP.NET

<asp:GridView ID="gvChallan" runat="server" AutoGenerateColumns="False" 
     CellPadding="3" HorizontalAlign="Center" 
     BackColor="White" BorderColor="#CCCCCC" Font-Size="Small"
    BorderStyle="None" BorderWidth="1px" ShowFooter="True" Width="950px" >
   <columns>

    <asp:TemplateField HeaderText="Product Name">
        <itemtemplate>
            <asp:DropDownList ID="drpproduct" Width="200px" runat="server" DataValueField="PName"
            onselectedindexchanged="drpproduct_SelectedIndexChanged" AutoPostBack="true" > 
         
        </itemtemplate>
        <HeaderStyle Width="200px" />
    

     <asp:TemplateField HeaderText="Sub Item">
        <itemtemplate>
             <asp:UpdatePanel ID="Upsubitem" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
                </Triggers>
            <contenttemplate>
                <asp:DropDownList ID="drpsubitem" Width="200px" runat="server" DataValueField="BName"
                onselectedindexchanged="drpsubitem_SelectedIndexChanged" AutoPostBack="true" >
                   
            </contenttemplate>
            
        </itemtemplate>
        
        <HeaderStyle Width="200px" />
    

    <asp:TemplateField HeaderText="Quantity">
        <itemtemplate>
            <asp:UpdatePanel ID="upqty" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
                </Triggers>
            <contenttemplate>
                <asp:TextBox ID="txtquantity" runat="server" MaxLength="5" CssClass="textb"
                 Width="70px" OnTextChanged="QtyChanged" AutoPostBack="true" >
            </contenttemplate>
            
        </itemtemplate>
        <HeaderStyle Width="70px" />
    

    <asp:TemplateField HeaderText="Unit">
        <itemtemplate>
             <asp:UpdatePanel ID="upUnit" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />

Posted 20-Feb-14 0:03am

Sandip Paul 491984

Updated 20-Feb-14 0:57am

Richard MacCutchan

v2

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Comments

[no name] 20-Feb-14 6:41am

What error you are getting

[no name] 20-Feb-14 6:41am

Could you provide some code here so that i can help you.

Sandip Paul 491984 20-Feb-14 6:55am

A control with ID 'txtrate' could not be found for the trigger in UpdatePanel 'uptotamt'.
This is the error i am getting

Sandip Paul 491984 20-Feb-14 6:55am

<asp:GridView ID="gvChallan" runat="server" AutoGenerateColumns="False"
CellPadding="3" HorizontalAlign="Center"
BackColor="White" BorderColor="#CCCCCC" Font-Size="Small"
BorderStyle="None" BorderWidth="1px" ShowFooter="True" Width="950px" >
<columns>
<asp:TemplateField HeaderText="Product Name">
<itemtemplate>
<asp:DropDownList ID="drpproduct" Width="200px" runat="server" DataValueField="PName"
onselectedindexchanged="drpproduct_SelectedIndexChanged" AutoPostBack="true" >

<HeaderStyle Width="200px" />

<asp:TemplateField HeaderText="Sub Item">
<itemtemplate>
<asp:UpdatePanel ID="Upsubitem" runat="server" UpdateMode="Conditional" RenderMode="Inline">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
</Triggers>
<contenttemplate>
<asp:DropDownList ID="drpsubitem" Width="200px" runat="server" DataValueField="BName"
onselectedindexchanged="drpsubitem_SelectedIndexChanged" AutoPostBack="true" >

<HeaderStyle Width="200px" />

<asp:TemplateField HeaderText="Quantity">
<itemtemplate>
<asp:UpdatePanel ID="upqty" runat="server" UpdateMode="Conditional" RenderMode="Inline">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
</Triggers>
<contenttemplate>
<asp:TextBox ID="txtquantity" runat="server" MaxLength="5" CssClass="textb"
Width="70px" OnTextChanged="QtyChanged" AutoPostBack="true" >

<HeaderStyle Width="70px" />

<asp:TemplateField HeaderText="Unit">
<itemtemplate>
<asp:UpdatePanel ID="upUnit" runat="server" UpdateMode="Conditional" RenderMode="Inline">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />

<contenttemplate>

Richard MacCutchan 20-Feb-14 6:55am

Please provide full detaiils of your problem: show the code that causes it, and the exact text of the error message(s).

Sandip Paul 491984 20-Feb-14 7:03am

Sir I am trying to create a invoice program in asp.net in which whenever a user select a product based on that product the rate will be fetched from database and show it on the grid and based on the quantity the amount will be calculated and show it on the amount column in the grid.beside that i have also added a total amount field just below the gridview in which the amount summary will be shown based on quantity chaged or rate changed but when i am trying to do i got that error

Sandip Paul 491984 20-Feb-14 7:05am

This is cs code:
protected void QtyChanged(object sender, EventArgs e)
{
GridViewRow row = (GridViewRow)drpsubitem.NamingContainer;
TextBox prate = (TextBox)row.FindControl("txtrate");
TextBox pqty = (TextBox)row.FindControl("txtquantity");
TextBox pamt = (TextBox)row.FindControl("txtamt");
pamt.Text = Convert.ToString(float.Parse(prate.Text) * Convert.ToInt32(pqty.Text));
float gvamt = 0;
foreach (GridViewRow g1 in gvChallan.Rows)
{
TextBox txtgvamt = (TextBox)g1.FindControl("txtamt");
gvamt = gvamt + float.Parse(txtgvamt.Text);
}
txttotamt.Text = Convert.ToString(gvamt);

}

protected void RateChanged(object sender, EventArgs e)
{
GridViewRow row = (GridViewRow)drpsubitem.NamingContainer;
TextBox prate = (TextBox)row.FindControl("txtrate");
TextBox pqty = (TextBox)row.FindControl("txtquantity");
TextBox pamt = (TextBox)row.FindControl("txtamt");
pamt.Text = Convert.ToString(float.Parse(prate.Text) * Convert.ToInt32(pqty.Text));

float gvamt = 0;
foreach (GridViewRow g1 in gvChallan.Rows)
{
TextBox txtgvamt = (TextBox)g1.FindControl("txtamt");
gvamt = gvamt + float.Parse(txtgvamt.Text);
}
txttotamt.Text = Convert.ToString(gvamt);

}

Richard MacCutchan 20-Feb-14 7:17am

The error message clearly tells you that is cannot find a control with the id txtrate.

Sandip Paul 491984 20-Feb-14 7:18am

but txtrate is there inside the gridview as a itemtemplate

Richard MacCutchan 20-Feb-14 8:27am

Look at where the message is generated and check the control ids and spelling. Use your debugger to see exactly why the message occurs.

Sandip Paul 491984 20-Feb-14 7:42am

r u there sir?

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