refresh button for datagridview - vb.net

Question

i need help in refresh the datagridview. I create a Update button and show button but it didn't refresh. but i check in my database access it update successful
Imports System.Data
Imports System.Data.OleDb
Public Class Form2
Public con As OleDbConnection
Public da As OleDbDataAdapter
Public ds As New DataSet
Public cmd As OleDbCommand
Public dr As OleDbDataReader
Dim count As Integer = 100
Dim ID As String
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Try
'Establish connection
con = New OleDbConnection("Provider = Microsoft.ACE.OLEDB.12.0; Data Source = C:\Users\m_j_g\Documents\Visual Studio 2010\Projects\DatabaseApplication\Department.accdb")
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
Private Sub btnShow_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnShow.Click
Try
'establish connection
con = New OleDbConnection("provider = Microsoft.ACE.OLEDB.12.0; data source = C:\Users\m_j_g\OneDrive\Documents\Database1.accdb")
'execute sql query
da = New OleDbDataAdapter("Select * from table1", con)
'Fill Dataset
da.Fill(ds, "table1")
'put data from dataset to datagridview
DataGridView1.DataSource = ds.Tables(0)
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
Private Sub btnUpdate_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnUpdate.Click
con = New OleDbConnection("provider = Microsoft.ACE.OLEDB.12.0; data source = C:\Users\m_j_g\OneDrive\Documents\Database1.accdb")
Try
con.Open()
cmd = New OleDbCommand("Update table1 set SurName='" & TextBox2.Text & "', FirstName='" & TextBox3.Text & "' where EmailAddress='" & TextBox5.Text & "'", con)
'Execute UPDATE Query
cmd.ExecuteNonQuery()
MsgBox("Record Updated Successfully..." & Chr(13) & "Email Address: " & TextBox5.Text & Chr(13) & "SurName: " & TextBox2.Text & Chr(13) & "FirstName: " & TextBox3.Text)
con.Close()
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
I am newbie in programming Thank you for your help

Answer 1

You need to rebind the Grid after performing the update, Follow these steps this may help you:
Define a Method for binding the giridiew, this will populate the grid with values from the DB:
Public Sub bindMyGrid()
con = New OleDbConnection("provider = Microsoft.ACE.OLEDB.12.0; data source = C:\Users\m_j_g\OneDrive\Documents\Database1.accdb")
da = New OleDbDataAdapter("Select * from table1", con)
da.Fill(ds, "table1")
DataGridView1.Rows.Clear() '<-- new line added
DataGridView1.DataSource = ds.Tables(0)
End Sub
Call the method in the click event of the show button to populate the grid:
Private Sub btnShow_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnShow.Click
Try
bindMyGrid()
Catch ex As Exception
' handle error here
End Try
End Sub
Perform the update operation on update button click, and call the method again to get the latest values.
Private Sub btnUpdate_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnUpdate.Click
Try
'Perform the update operations here
' Call bindMyGrid() to rebind the grid
bindMyGrid() 'this will populate the new value to the grid.
Catch ex As Exception
'Handle error here
End Try
End Sub