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How to edit a single column in gridview? Asp.net 2.0, vb, sql express

Posted on 2010-11-21
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Last Modified: 2012-08-14
I want to be able to readout all columns in a table called qAdvent but allow insert/update of only one column. Is there a way to do this?

I would prefer that the column that performs the update contain a dropdown list with Yes and No as the choices. The underlying field is a text field that will have either yes or no.

Here's my gridview code. I don't know where to go from here.


<asp:GridView ID="GridView1" runat="server" AllowPaging="True" 
               AllowSorting="True" AutoGenerateColumns="False" CellPadding="4" 
               DataSourceID="SqlDataSource1" ForeColor="#333333" GridLines="None" 
                DataKeyNames="qAdventID">
               <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
               <Columns>
                   <asp:CommandField ShowEditButton="True" />
                   <asp:BoundField DataField="quoteNum" HeaderText="quoteNum" 
                       SortExpression="quoteNum" InsertVisible="False" />
                   <asp:BoundField DataField="contract" HeaderText="contract" 
                       SortExpression="contract" />
                   <asp:BoundField DataField="location" HeaderText="location" 
                       SortExpression="location" />
                   <asp:BoundField DataField="serviceLevel" HeaderText="serviceLevel" 
                       SortExpression="serviceLevel" />
                   <asp:BoundField DataField="clientName" HeaderText="clientName" 
                       SortExpression="clientName" />
                   <asp:BoundField DataField="address1" HeaderText="address1" 
                       SortExpression="address1" />
                   <asp:BoundField DataField="city" HeaderText="city" 
                       SortExpression="city" />
                   <asp:BoundField DataField="itemName" HeaderText="itemName" 
                       SortExpression="itemName" />
                   <asp:BoundField DataField="serialNum" HeaderText="serialNum" 
                       SortExpression="serialNum" />
                   <asp:BoundField DataField="beginDate" HeaderText="beginDate" 
                       SortExpression="beginDate" />
                   <asp:BoundField DataField="endDate" HeaderText="endDate" 
                       SortExpression="endDate" />
                   <asp:BoundField DataField="annCost" HeaderText="annCost" 
                       SortExpression="annCost" />
                   <asp:BoundField DataField="proRateCost" HeaderText="proRateCost" 
                       SortExpression="proRateCost" />
                   <asp:BoundField DataField="flagForRemoval" HeaderText="flagForRemoval" 
                       SortExpression="flagForRemoval" />
               </Columns>
               <EditRowStyle BackColor="#999999" />
               <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
               <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
               <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
               <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
               <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
               <SortedAscendingCellStyle BackColor="#E9E7E2" />
               <SortedAscendingHeaderStyle BackColor="#506C8C" />
               <SortedDescendingCellStyle BackColor="#FFFDF8" />
               <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
           </asp:GridView>

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Question by:MHenry
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Accepted Solution

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Carl Tawn earned 500 total points
ID: 34184425
making a single column editable is easy enough, you just need to add:

ReadOnly="true"

To all of the columns that should not be editable.

You will need to use a TemplateField for the column that should be a dropdown. This should get you started:

    http://msdn.microsoft.com/en-us/library/bb288032.aspx
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by:MHenry
ID: 34184754
carl_tawn,

When I did it that way, it erased everything in the database by assigning everything as null except that one column.

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by:MHenry
ID: 34184759
I would also like to do this with a submit button instead of as an edit field. That way I can send an email notification when it has been updated if at all possible.
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by:MHenry
ID: 34184876
ah. convertEmptyStringToNull needs to be set to false.

anyway to do this with a button though? Really need to send a notification email.
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by:MHenry
ID: 34184982
still stripping out everything even with the convertEmptyStringToNull set to false...
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Expert Comment

by:Carl Tawn
ID: 34186072
What update command are you using for your SqlDataSource?
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Author Comment

by:MHenry
ID: 34188669
I used the standard thing inserted by vs2010
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:adventConnectionString %>"
            
            SelectCommand="SELECT * FROM [qAdvent] ORDER BY [quoteNum] DESC, [contract] DESC" 
            DeleteCommand="DELETE FROM [qAdvent] WHERE [qAdventID] = @qAdventID" 
            InsertCommand="INSERT INTO [qAdvent] ([dbDate], [quoteNum], [contract], [location], [serviceLevel], [clientName], [address1], [city], [itemName], [serialNum], [beginDate], [endDate], [annCost], [proRateCost], [flagForRemoval]) VALUES (@dbDate, @quoteNum, @contract, @location, @serviceLevel, @clientName, @address1, @city, @itemName, @serialNum, @beginDate, @endDate, @annCost, @proRateCost, @flagForRemoval)" 
            UpdateCommand="UPDATE [qAdvent] SET [dbDate] = @dbDate, [quoteNum] = @quoteNum, [contract] = @contract, [location] = @location, [serviceLevel] = @serviceLevel, [clientName] = @clientName, [address1] = @address1, [city] = @city, [itemName] = @itemName, [serialNum] = @serialNum, [beginDate] = @beginDate, [endDate] = @endDate, [annCost] = @annCost, [proRateCost] = @proRateCost, [flagForRemoval] = @flagForRemoval WHERE [qAdventID] = @qAdventID">

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Expert Comment

by:Carl Tawn
ID: 34189883
Ok, because you are deviating from the IDE generated code you will need to manually tweak the UPDATE statement and it's associated parameters to exlude the columns that you want to have as read only.

So, remove each column name (enclosed in []) and each associated parameter (things starting with @), and then remove the corresponding elements from the <UpdateParameters> element. You need to leave the [qAdventID] column in there though because that is the key used for performing the update.
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by:MHenry
ID: 34192589
woo hoo!

thanks carl_tawn!
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