No updates in gridview records using Gridview textbox

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C#

ASP.NET

Hi folks,
I am doing update record from Gridview and but updation of record in not happens

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
       {

           try
           {

               objBusinessUI.ProductCategory_ID = Int32.Parse(GridView1.DataKeys[e.RowIndex].Value.ToString());
               GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
               objBusinessUI.ProductCategory_Name = ((TextBox)(GridView1.Rows[e.RowIndex].FindControl("txtProdCategory"))).Text.Trim();
             //  objBusinessUI.ProductCategory_Name = (GridView1.Rows[e.RowIndex].FindControl("txtProdCategory") as TextBox).Text;
               objBusinessUI.UpdatedBy = "Admin";
               objBusinessUI.UpdatedOn = DateTime.Now;
               string strmsg = objDataUI.UpdateProductCat(objBusinessUI);
               if (strmsg == "SUCCESS")
               {

               }
               else
               {

               }
               GridView1.EditIndex = -1;
               BindGridData();
         }

this is my row updating event code..so please try to help me
thanxx in advance