I am currently working in VB.NET express for desktop, 2013. I am having a hard time binding SQL data to some datagridviews on a loop with an array. I am receiving an object null error and its because on the direct cast line its not pulling the datagridview. I have multiple datagridviews on a tab control tool, one datagridview per tab. Here is my code:
try
Dim array() As Integer = {"2", "3", "4", "7", "8", "10", "11", "12"}
For Each value As Integer In array
Dim RelativeDGV = DirectCast(Me.Controls("DataGridLine" & value), DataGridView)
Using conn1 As New SqlConnection(connstring)
conn1.Open()
Using comm1 As New SqlCommand("SELECT LineNumber FROM tableA where LineNumber = @LineNumber", conn1)
comm1.Parameters.AddWithValue("@LineNumber", value)
Dim dt As New DataTable
Dim sql As New SqlDataAdapter(comm1)
sql.Fill(dt)
RelativeDGV.DataSource = dt
End Using
conn1.Close()
End Using
Next
Catch ex As Exception
MsgBox(ex.ToString)
End Try
The error is on line
Dim RelativeDGV = DirectCast(Me.Controls("DataGridLine" & value), DataGridView)
But the null error dosen't trigger until
RelativeDGV.DataSource = dt
Try to use list of
DataGridView
like this :