How to filter file extension and get file size in C# ?

 Here form this function I'm trying to filter extension and size for uploading  a file in asp.net
public static string FilteredFileExtension(HttpPostedFile httpPostedFile)
    {
        int intFileLength = httpPostedFile.ContentLength;   // File size
        string strExtn = System.IO.Path.GetExtension(httpPostedFile.FileName.ToLower()); //File extension
        if (intFileLength < 4096000)// 4mb
        {
            if (strExtn == ".jpg" || strExtn == ".gif" || strExtn == ".png")
            {
                return string.Empty;  // only jpg,gif and png files and less dn 4mb can be uploaded
            }
            else
            {
                return strExtn + " File not accepted";
            }
        }
        else
        {
            return "File is very large";
        }
    }

How to find control on GridView RowCommand Event?

Here I'm showing how to find a control within a gridview to get some data of that control.
<Columns>
 <asp:TemplateField HeaderText="Team">
    <ItemTemplate>
     <asp:Label ID="lblTeam" runat="server" Text='<%# Eval("TeamName")%>'></asp:Label>
   </ItemTemplate>
 </asp:TemplateField>
</Columns>
<Columns>
 <asp:TemplateField>
    <ItemTemplate>
       <asp:LinkButton ID="lnkEdit" Text="EDIT" runat="server" CssClass="coachEdit"   CommandArgument='<%# Eval("TeamId")%>' CommandName="Redirect"></asp:LinkButton>
   </ItemTemplate>
 </asp:TemplateField>
</Columns>

Here i need the Team Name from the lblTeam and I'm like to get this when I click the Edit link means lnkEdit  so on RowCommand event i have to write this code


GridViewRow row = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
 Label lblDate = (Label)row.Cells[0].FindControl("lblDate");
string teamName= lblDate.Text;
int rowindex = row.RowIndex;

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