Unable to cast object of type 'ASP.memberpages_tour_entry_passportlist_aspx' to type 'System.Web.UI.WebControls.GridViewRow'

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VB

ASP.NET

SQL

I am trying to create a gridview with some textboxes where user can input.
but when i run it, i get this error

'''
Unable to cast object of type 'aspx' to type 'System.Web.UI.WebControls.GridViewRow'.
'''


Markup

'''
<asp:Button ID="btnAdd" runat="server" Font-Bold="True" Height="42px" OnClick="btnAdd_Click" Text ="Add Record" Width="116px" />
'''

Code Behind (VB)
'''
Protected Sub Gridview1_PageIndexChanging(sender As Object, e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles GridView1.PageIndexChanging

GridView1.PageIndex = e.NewPageIndex
bindGrid()

End Sub

Protected Sub btnAdd_Click(sender As Object, e As EventArgs)

Dim btn As Button = DirectCast(sender, Button)
Dim GrdRow As GridViewRow = DirectCast(btn.Parent.Parent, GridViewRow)

Dim txtTGID As TextBox = DirectCast(GrdRow.Cells(0).FindControl("txtReturnTGID"), TextBox)
Dim txtPassNo As TextBox = DirectCast(GrdRow.Cells(0).FindControl("txtPassNo"), TextBox)
Dim txtTouristName As TextBox = DirectCast(GrdRow.Cells(0).FindControl("txtPassName"), TextBox)

Using conn1 As New SqlConnection(ConfigurationManager.ConnectionStrings("CommissionConnectionString2").ConnectionString)
Using cmd1 As New SqlCommand("SELECT * FROM dbo.Tour_Detail")

With cmd1
.Connection = conn1 : conn1.Open()

.CommandText = "INSERT INTO dbo.Tour_detail (Tour_Group_ID, Passport_No, Tourist_Name) VALUES (@Tour_Group_ID, @Passport_No, @ Tourist_Name)"
.Parameters.AddWithValue("@Tour_Group_ID", Trim(txtReturnTGID.Text))
.Parameters.AddWithValue("@Passport_No", Trim(txtPassNo.Text))
.Parameters.AddWithValue("@Tourist_Name", Trim(txtPassName.Text))

.ExecuteNonQuery()
End With

End Using

End Using
bindGrid()
End Sub
'''