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How do i loop through my gridview to save changed data?

Posted on 2011-09-05
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Last Modified: 2012-05-12
I've pulled some data, into a gridview control. The gridview contains text box controls that are editable. I'd like to save the data that gets edited when the user clicks the / a save button. How do i lool through the rows in the grid view, in the code behind (C#), to process (capture) the changed data for saving?
<asp:UpdatePanel runat="server" ID="upStudentLoginGrid" UpdateMode="Conditional">
    <ContentTemplate>
        <asp:GridView ID="gdvTimeRecs" runat="server" AutoGenerateColumns="false" CssClass="SignedInGrid"
            GridLines="None" AllowSorting="true" AllowPaging="true" PageSize="20" PageIndex="0"
            PagerStyle-HorizontalAlign="Center" OnRowDataBound="gdvTimeRecs_OnRowDataBound">
            <Columns>
                <asp:TemplateField HeaderText="Student Name" ItemStyle-CssClass="StudentName">
                    <ItemTemplate>
                        <asp:Label ID="lblStudentName" runat="server" CssClass="StudentNameLabel" Text='<%# Eval("StudentName") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Student ID">
                    <ItemTemplate>
                        <asp:Label ID="lblAthleteUid" runat="server" Text='<%# Eval("StudentId") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Time In">
                    <ItemTemplate>
                        <%--<asp:Label ID="lblTimeIn" runat="server" Text='<%# Eval("TimeIn") %>'></asp:Label>--%>
                        <asp:TextBox ID="tbxTimeIn" runat="server" Text='<%# Eval("TimeIn") %>' Width="150px"></asp:TextBox>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Time Out">
                    <ItemTemplate>
                        <%--<asp:Label ID="lblTimeOut" runat="server" Text='<%# Eval("TimeOut") %>'></asp:Label>--%>
                        <asp:TextBox ID="tbxTimeOut" runat="server" Text='<%# Eval("TimeOut") %>' Width="150px"></asp:TextBox>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>
    </ContentTemplate>
</asp:UpdatePanel>

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Question by:mikesExpertExchange
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by:mikesExpertExchange
ID: 36486236
i should add that the button the user will click to save the changed data, is on a page that contains the user control that contains the grid...
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by:disrupt
ID: 36486246
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by:mikesExpertExchange
ID: 36490599
@disrupt: based on your response, (the link) and the research / testing i've done (don't worry you'll get full credit ;-) ) i'm guessing that in order to "grab" the values that populate the grid, the values need to be in TextBox controls? in my code snippet below, ran against the same grid defined above,...i can get the text from the TextBox controls, but the not the <asp:Lable> control, (which on the code side I had to cast to a LiteralControl). Is there a way to grab the value of the label in the grid?
//i get the value that is in the TextBox, (test), but not the value //from the lable (test1)...

        string test = "";
        string test1;
        foreach (GridViewRow row in gdvTimeRecs.Rows)
        {
            TextBox txbx = (TextBox)row.FindControl("tbxTimeIn");
            
            if ( txbx != null)
                test = txbx.Text;

            test1 = ((LiteralControl)(row.Cells[0].Controls[0])).Text;

        }

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disrupt earned 500 total points
ID: 36490759
have you tried:

Label testL = (Label)row.FindControl("lblAthleteUid");

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by:disrupt
ID: 36490774
If you have trouble using the code above and  picking it up you can use a recurisve find :)

http://sharpertutorials.com/recursive-findcontrol/

Note: you wont need to iterate through the gridview with the recursive find.
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Author Closing Comment

by:mikesExpertExchange
ID: 36490839
that did it. seemed like i'd tried that before. but maybe i'd only tried something similar or close to that, and well,...almost only counts in horse shoes and hand grenades,... so thanks...
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