Gridview in asp.net Error

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ASP.NET

Hi ..

i m getting Error in Gridview when i m trying to gridview_rowupdatin()event

error : NullReferenceException was Unhandled by user code

object reference not set to an instance of an object

What i m doing wreong here..?

Protected Sub GrdHRProcess_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GrdHRProcess.RowCommand

       Dim MyConnection1 As SqlConnection
       Dim uid As String
       MyConnection1 = New SqlConnection(ConfigurationManager.ConnectionStrings("HRProcessConnectionString").ConnectionString)
       Dim sql1 As String
       sql1 = "select max(UDetailId) from HRProcess_Detail"
       Dim com As SqlCommand = New SqlCommand(sql1, MyConnection1)
       com.Connection.Open()
       uid = Convert.ToString(com.ExecuteScalar)
       com.Connection.Close()

       uid = uid + 1

       Dim conn As New SqlConnection
       conn = New SqlConnection(ConfigurationManager.ConnectionStrings("HRProcessConnectionString").ConnectionString)

       If (e.CommandName.Equals("AddNew")) Then



           Dim txtNewName1 As TextBox = GrdHRProcess.FooterRow.FindControl("txtNewName")
           Dim txtNewContact1 As TextBox = GrdHRProcess.FooterRow.FindControl("txtNewContact")
           Dim txtNewCallDate1 As TextBox = GrdHRProcess.FooterRow.FindControl("txtNewCallDate")
           Dim txtNewCallTime1 As TextBox = GrdHRProcess.FooterRow.FindControl("txtNewCallTime")
           Dim txtNewStartDate1 As TextBox = GrdHRProcess.FooterRow.FindControl("txtNewSD")
           Dim txtNewClass1 As TextBox = GrdHRProcess.FooterRow.FindControl("txtNewClass")
           Dim ddlNewStatus1 As DropDownList = GrdHRProcess.FooterRow.FindControl("ddlNewStatus")
           conn.Open()
           Dim cmd As New SqlCommand("Insert into HRProcess_Detail(UDetailId,CandidateName,ContactNo,CallDate,CallTime,StartDate,Class,Status) values('" & uid & "','" & txtNewName1.Text & "','" & txtNewContact1.Text & "','" & txtNewCallDate1.Text & "', '" & txtNewCallTime1.Text & "','" & txtNewStartDate1.Text & "', '" & txtNewClass1.Text & "','" & ddlNewStatus1.Text & "')", conn)
           cmd.ExecuteNonQuery()

           conn.Close()

       End If
   End Sub