Gridview Show and Hide a Specific Column - vb.net

Question

I have a gridview in which a specific column Date. I have set the Visible property of column to false because I want to show on different conditions of page. Please tell me how can I do it using vb.net that my Date column should show or hide at runtime
Update
My current code is
If Not Page.User.Identity.Name = "bilal" Then
GridView1.AutoGenerateEditButton = False
GridView2.AutoGenerateEditButton = False
GridView3.AutoGenerateEditButton = False
Else
GridView1.AutoGenerateEditButton = True
GridView1.AutoGenerateColumns = True
GridView1.DataBind()
If GridView1.Columns.Count > 0 Then
'assuming your date-column is the first '
GridView1.Columns(3).Visible = True
Else
GridView1.HeaderRow.Cells(0).Visible = False
For Each gvr As GridViewRow In GridView1.Rows
gvr.Cells(0).Visible = True
Next
End If
GridView2.AutoGenerateEditButton = True
GridView3.AutoGenerateEditButton = True
End If

Answer 1

If you've set AutoGenerateColumns to True, the Column-Count will be 0, then you need to loop the rows and show/hide the appropriate cells. Otherwise you can use the Visible property.
GridView1.DataBind()
If GridView1.Columns.Count > 0 Then
'assuming your date-column is the 4.'
GridView1.Columns(3).Visible = True
Else
GridView1.HeaderRow.Cells(3).Visible = False
For Each gvr As GridViewRow In GridView1.Rows
gvr.Cells(3).Visible = True
Next
End If