Question

I have a table with the following colums:

FileID | username | filename

I am using a gridview which has two colums:

FileName | Download

In the download column i am having a button called Download which will be used to download files. Now i want to retrieve the fileID or Filename when i click Download button.

I tried this line to get the fileid but it was giving an error:

int FileID = (int)GridView1.DataKeys[Convert.ToInt32(e.CommandArgument)].Value;

Error:
System.ArgumentOutOfRangeException was unhandled by user code
Message=Index was out of range. Must be non-negative and less than the size of the collection.

Here’s my aspx page code:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="filelist" 
    Width="404px" onrowcommand="GridView1_RowCommand" Height="131px">
    <Columns>
        <asp:BoundField DataField="fileid" HeaderText="fileid" InsertVisible="False" 
            ReadOnly="True" SortExpression="fileid" Visible="False" />
        <asp:BoundField DataField="userid" HeaderText="userid" SortExpression="userid" 
            Visible="False" />
        <asp:BoundField DataField="filename" HeaderText="FileName" 
            SortExpression="filename" />
        <asp:ButtonField HeaderText="Download" Text="Download" CommandName="download"/>
    </Columns>
</asp:GridView>


<asp:SqlDataSource ID="filelist" runat="server" 
    ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
    SelectCommand="SELECT * FROM [FileDetails] WHERE ([userid] = @userid)">
    <SelectParameters>
        <asp:SessionParameter Name="userid" SessionField="userid" Type="Int32" />
    </SelectParameters>
</asp:SqlDataSource>

Is there another way to do this?

Answer 1

Here is how I would access the value in a column inside a datagrid

GridView1.Rows[rowId].Cells[columnId].Value