Null reference exception was unhandled by user code

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Hi, help me for the error code Null reference exception was unhandled by user code

Protected Sub lbInsert_Click(ByVal sender As Object, ByVal e As System.EventArgs)
AccessDataSource1.InsertParameters("Nama").DefaultValue =
DirectCast(GridView1.FooterRow.FindControl("txtNama"), TextBox).Text

AccessDataSource1.InsertParameters("NpwpPemotong").DefaultValue =
DirectCast(GridView1.FooterRow.FindControl("txtNPWP"), TextBox).Text

AccessDataSource1.InsertParameters("NomorBukti").DefaultValue =
DirectCast(GridView1.FooterRow.FindControl("txtNomorBukti"), TextBox).Text

AccessDataSource1.InsertParameters("TglBuktiPemotong").DefaultValue =
DirectCast(GridView1.FooterRow.FindControl("txtTglBukti"), Calendar).SelectedDate

AccessDataSource1.InsertParameters("JenisPajak").DefaultValue =
DirectCast(GridView1.FooterRow.FindControl("ddlInsertJenisPajak"), DropDownList).SelectedValue

AccessDataSource1.InsertParameters("JumlahPPH").DefaultValue =
DirectCast(GridView1.FooterRow.FindControl("txtJumlahPPH"), TextBox).Text
AccessDataSource1.Insert()
End Sub

thanks

What I have tried:

Null reference exception was unhandled by user code

Posted 6-Jun-16 11:32am

Member 12568949

Updated 6-Jun-16 12:03pm

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cexxx · Answer 1 · 2016-06-06T12:03:00

I think that you have validate if exists controls before you asigned value...

XML

AccessDataSource1.InsertParameters("Nama").DefaultValue = <pre lang="XML">GridView1.FooterRow.FindControl(&quot;txtNama&quot;) <> null ?
DirectCast(GridView1.FooterRow.FindControl(&quot;txtNama&quot;), TextBox).Text</pre> : ""