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Columncount property cannot be set on a data-bound datagridview control. In VB.NET

What I have tried:

con = New SqlConnection(conn)
       con.Open()
       ds = New DataSet()
       da = New SqlDataAdapter("select Cid,Name,Gender,dob,RationNo,PanId,voteId,Address,Phone,EmailId,NomineeStatus,photo from CustomerReg where statuss=1 ", con)
       da.Fill(ds)
       If ds.Tables(0).Rows.Count > 0 Then

           DataGridView1.AutoGenerateColumns = False
           DataGridView1.ColumnCount = 12
           DataGridView1.Columns(0).Name = "cid"
           DataGridView1.Columns(0).HeaderText = "Customer ID"
           DataGridView1.Columns(0).DataPropertyName = "Cid"

           DataGridView1.Columns(1).Name = "Name"
           DataGridView1.Columns(1).HeaderText = "Customer Name"
           DataGridView1.Columns(1).DataPropertyName = "Name"

           DataGridView1.Columns(2).Name = "Gender"
           DataGridView1.Columns(2).HeaderText = "Gender"
           DataGridView1.Columns(2).DataPropertyName = "Gender"

           DataGridView1.Columns(3).Name = "DOB"
           DataGridView1.Columns(3).HeaderText = "DOB"
           DataGridView1.Columns(3).DataPropertyName = "DOB"

           DataGridView1.Columns(4).Name = "RationNO"
           DataGridView1.Columns(4).HeaderText = "Ration Card No"
           DataGridView1.Columns(4).DataPropertyName = "RationNO"

           DataGridView1.Columns(5).Name = "PanId"
           DataGridView1.Columns(5).HeaderText = "Pancard ID"
           DataGridView1.Columns(5).DataPropertyName = "PanId"

           DataGridView1.Columns(6).Name = "voteid"
           DataGridView1.Columns(6).HeaderText = "Voters ID"
           DataGridView1.Columns(6).DataPropertyName = "voteid"

           DataGridView1.Columns(7).Name = "Address"
           DataGridView1.Columns(7).HeaderText = "Address"
           DataGridView1.Columns(7).DataPropertyName = "Address"

           DataGridView1.Columns(8).Name = "Phone"
           DataGridView1.Columns(8).HeaderText = "Phone"
           DataGridView1.Columns(8).DataPropertyName = "Phone"

           DataGridView1.Columns(9).Name = "EmailId"
           DataGridView1.Columns(9).HeaderText = "Email ID"
           DataGridView1.Columns(9).DataPropertyName = "EmailId"

           DataGridView1.Columns(10).Name = "NomineeStatus"
           DataGridView1.Columns(10).HeaderText = "Nominee Status"
           DataGridView1.Columns(10).DataPropertyName = "NomineeStatus"

           DataGridView1.Columns(11).Name = "Photo"
           DataGridView1.Columns(11).HeaderText = "Photo"
           DataGridView1.Columns(11).DataPropertyName = "Photo"

           DataGridView1.DataSource = ds.Tables(0)
           DataGridView1.Refresh()



       End If
       con.Close()
   End Sub

   Private Sub DataGridView1_RowHeaderMouseClick(sender As Object, e As DataGridViewCellMouseEventArgs) Handles DataGridView1.RowHeaderMouseClick
       ' Dim sts As String
       txtID.Text = DataGridView1.Rows(e.RowIndex).Cells(0).Value.ToString()
       txtName.Text = DataGridView1.Rows(e.RowIndex).Cells(1).Value.ToString()
       sex = DataGridView1.Rows(e.RowIndex).Cells(2).Value.ToString()
       If sex = "M" Then
           rbtmale.Checked = True
       Else
           rbtfmale.Checked = True


       End If
       DateTimePicker1.Value = DataGridView1.Rows(e.RowIndex).Cells(3).Value.ToString()
       txtrcno.Text = DataGridView1.Rows(e.RowIndex).Cells(4).Value.ToString()
       txtpcno.Text = DataGridView1.Rows(e.RowIndex).Cells(5).Value.ToString()
       txtvid.Text = DataGridView1.Rows(e.RowIndex).Cells(6).Value.ToString()
       txtaddress.Text = DataGridView1.Rows(e.RowIndex).Cells(7).Value.ToString()
       txtphone.Text = DataGridView1.Rows(e.RowIndex).Cells(8).Value.ToString()
       txtemail.Text = DataGridView1.Rows(e.RowIndex).Cells(9).Value.ToString()
       sts = DataGridView1.Rows(e.RowIndex).Cells(10).Value.ToString()
       If sts = "Y" Then
           CheckBox1.Checked = True
       Else
           CheckBox1.Checked = False

       End If
       fileName = DataGridView1.Rows(e.RowIndex).Cells(11).Value.ToString()
       PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
       PictureBox1.ClientSize = New Size(177, 197)
       PictureBox1.Image = Image.FromFile(fileName)
Posted
Updated 12-Jun-20 21:48pm
v2
Comments
Maciej Los 13-Jun-20 2:51am    
Not a question at all!

1 solution

The error is pretty explicit:
Columncount property cannot be set on a data-bound datagridview control
Ant what it means is: if your DGV has a DataSource, you cannot control the number of columns because the source requires a specific number.
So if you want to do "special things" with a databound DGV, you need to remove any existing binding first, by setting the DataSource property to Nothing.
VB
DataGridView1.DataSource = Nothing
DataGridView1.AutoGenerateColumns = False
DataGridView1.ColumnCount = 12
...
DataGridView1.Columns(11).DataPropertyName = "Photo"

DataGridView1.DataSource = ds.Tables(0)
 
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