如何使用vb.net顯示數據庫中的記錄

Question

我有多個組合框需要顯示候選人的名稱，從總統到繆斯，沒有按任何按鈕，但我不知道該怎麼做。

公共類Frm_ElemBallot

Private Sub ComboBox7_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox7.SelectedIndexChanged 

End Sub 

Private Sub Frm_ElemBallot_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 

End Sub 

末級

我應該怎麼把它連接到數據庫？

Answer 1

你應該嘗試這種方式

示例代碼：

Try 
      Dim cn As SqlConnection 
      Dim strCnn As String = "Your data base connection string" 
      cn = New SqlConnection(strCnn) 
      cn.Open() 
      Dim comm As New SqlCommand("Your sp or Command text to get the data from DB", cn) 
      '' If ur using Sp then Commandtype= CommandType.StoredProcedure if 'is Text then comm.CommandType=CommandType.Text 
      comm.CommandType = CommandType.StoredProcedure 
      Dim da As New SqlDataAdapter(comm) 
      Dim ds As New DataSet 
      da.Fill(ds) 
      ListBox1.Items.Clear() 
      If ds.Tables.Count > 0 And ds.Tables(0).Rows.Count > 0 Then 
       ListBox1.DataSource = ds 
      End If 
      ''Close your connections and commands. 
     Catch ex As Exception 
      ''Handle error if any 
     End Try