How to Update/Set the textbox value after Grid Updating.

Question

Dear,

I wrote below code when grid update then fire that code and set the value in TextBox/Label.

I debug the below code and see the Value is getting but not showing in TextBox/Label.

When it showing when the complete page getting refreshed.

I called in Page_Load also.

Private Sub frm_getObjectivescore()

con.Open()

cmd = New SqlClient.SqlCommand("select sum(Value) as T_Count from View_EmployeeAp Where Apr_No=" & Request("Apr_No") & "", con)

dr = cmd.ExecuteReader()

If dr.HasRows Then

While dr.Read

TextBox1.Text = Math.Round(dr("T_Count") * 0.4, 2)

End While

End If

con.Close()

End Sub