Question

How to display a defualt profile image in gridview if user didn’t provided any image.

if (fileUpload.PostedFile == null) 
{ 
    lblStatus.Text = "No file specified."; 
    return; 
} 
else
{        
{

Answer 1

One approach might be to check each row during RowDataBound event to see image exists or not. If it is empty, you can assign a default image url.

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{        
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
        Image image= (Image)e.Row.FindControl("ImageForPerson");

        if (image != null && image.ImageIrl == "")
        {
            image.ImageUrl = // default image url goes here
        }
    }
}

Do not forget to add RowDataBound event to your GridView definition.

<asp:GridView ID="GridView1" OnRowDataBound="GridView1_RowDataBound" />

---

Or If you do not want to use RowDataBound event. At Page_Load you can manually go through each Row of GridView and check ImageUrl one by one.

protected void Page_Load(object sender, EventArgs e)
{
     foreach(GridViewRow gvr in GridView1.Rows)
     {
         Image image = (Image)gvr.FindControl("ImageForPerson");

         if (image != null && image.ImageIrl == "")
         {
             image.ImageUrl = // default image url goes here
         }
     }
}