[c#] Catching "Maximum request length exceeded"

One way to do this is to set the maximum size in web.config as has already been stated above e.g.

<system.web>         
    <httpRuntime maxRequestLength="102400" />     
</system.web>

then when you handle the upload event, check the size and if its over a specific amount, you can trap it e.g.

protected void btnUploadImage_OnClick(object sender, EventArgs e)
{
    if (fil.FileBytes.Length > 51200)
    {
         TextBoxMsg.Text = "file size must be less than 50KB";
    }
}

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