Imports System.Linq
Imports System.Data.SqlClient
Imports System.Data.OleDb
Imports Microsoft.Office.Core
Imports Excel = Microsoft.Office.Interop.Excel
Imports ExcelAutoFormat = Microsoft.Office.Interop.Excel.XlRangeAutoFormat
Imports Microsoft.Office.Interop
Imports System.IO
Imports System.Xml.XPath
Imports System.Data
Imports System.Xml
Public Class Form1
Private ListItemType As Object
Public Property DataGrid1 As Object
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.CenterToScreen()
End Sub
Private Sub TextBoxNumberOfRows_KeyPress(sender As Object, e As KeyPressEventArgs) Handles TextBoxNumberOfRows.KeyPress
If Not ((e.KeyChar >= "0" And e.KeyChar <= "9") Or e.KeyChar = vbBack Or e.KeyChar = "+") Then
MessageBox.Show("Invalid Input! Numbers Only.", "Error Message", MessageBoxButtons.OK, MessageBoxIcon.Error)
e.Handled = True
End If
End Sub
Private Sub ButtonDataCreate_Click(sender As Object, e As EventArgs) Handles ButtonDataCreate.Click
If TextBoxNumberOfRows.Text = "" Then
MessageBox.Show("Number of Row cannot be empty !!!", "Error Message", MessageBoxButtons.OK, MessageBoxIcon.Error)
Return
End If
ButtonCreateData.Text = "Please Wait..."
ButtonCreateData.Enabled = False
For i As Integer = 1 To TextBoxNumberOfRows.Text
With DataGridView1.Rows
.Add(i, "10000" & i, "OPTIFAST SHAKE", "061-" & i)
End With
Next
ButtonCreateData.Text = "Make Data"
ButtonCreateData.Enabled = True
End Sub
Private Sub ButtonExporttoExcel_Click(sender As Object, e As EventArgs) Handles ExporttoExcel.Click
Try
ExporttoExcel.Text = "Please Wait..."
ExporttoExcel.Enabled = False
SaveFileDialog1.Filter = "Excel Document (*.xlsx)|*.xlsx"
If SaveFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
Dim xlApp As Microsoft.Office.Interop.Excel.Application
Dim xlWorkBook As Microsoft.Office.Interop.Excel.Workbook
Dim xlWorkSheet As Microsoft.Office.Interop.Excel.Worksheet
Dim misValue As Object = System.Reflection.Missing.Value
Dim i As Integer
Dim j As Integer
xlApp = New Microsoft.Office.Interop.Excel.Application
xlWorkBook = xlApp.Workbooks.Add(misValue)
xlWorkSheet = xlWorkBook.Sheets("sheet1")
For i = 0 To DataGridView1.RowCount - 2
For j = 0 To DataGridView1.ColumnCount - 1
For k As Integer = 1 To DataGridView1.Columns.Count
xlWorkSheet.Cells(1, k) = DataGridView1.Columns(k - 1).HeaderText
xlWorkSheet.Cells(i + 2, j + 1) = DataGridView1(j, i).Value.ToString()
Next
Next
Next
xlWorkSheet.SaveAs(SaveFileDialog1.FileName)
xlWorkBook.Close()
xlApp.Quit()
releaseObject(xlApp)
releaseObject(xlWorkBook)
releaseObject(xlWorkSheet)
MsgBox("Successfully saved" & vbCrLf & "File are saved at : " & SaveFileDialog1.FileName, MsgBoxStyle.Information, "Information")
ExporttoExcel.Text = "Export To MS Excel"
ExporttoExcel.Enabled = True
End If
Catch ex As Exception
MessageBox.Show("Failed to save !!!", "Error Message", MessageBoxButtons.OK, MessageBoxIcon.Error)
Return
End Try
End Sub
Private Sub releaseObject(obj As Object)
Try
System.Runtime.InteropServices.Marshal.ReleaseComObject(obj)
obj = Nothing
Catch ex As Exception
obj = Nothing
Finally
GC.Collect()
End Try
End Sub
Private Sub ButtonClearDVG_Click(sender As Object, e As EventArgs) Handles ButtonClearDVG.Click
DataGridView1.Columns.Clear()
If DataGridView1.Columns.Count = 0 Then
With DataGridView1
.Columns.Clear()
.Columns.Add("No", "No")
.Columns.Add("PLU", "PLU")
.Columns.Add("DESCRIPTION", "DESCRIPTION")
.Columns.Add("QTY", "QTY")
End With
End If
DataGridView1.DataSource = Nothing
End Sub
Private Sub ButtonImportFromExcel_Click(sender As Object, e As EventArgs) Handles ButtonImportFromExcel.Click
Dim conn As OleDbConnection
Dim dtr As OleDbDataReader
Dim dta As OleDbDataAdapter
Dim cmd As OleDbCommand
Dim dts As DataSet
Dim excel As String
Dim OpenFileDialog As New OpenFileDialog
OpenFileDialog1.FileName = ""
OpenFileDialog1.InitialDirectory = My.Computer.FileSystem.SpecialDirectories.Desktop
OpenFileDialog1.Filter = "All Files (*.*)|*.*|Excel files (*.xlsx)|*.xlsx|CSV Files (*.csv)|*.csv|XLS Files (*.xls)|*xls"
If (OpenFileDialog1.ShowDialog(Me) = System.Windows.Forms.DialogResult.OK) Then
DataGridView1.Columns.Clear()
Dim fi As New FileInfo(OpenFileDialog1.FileName)
Dim FileName As String = OpenFileDialog1.FileName
excel = fi.FullName
conn = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + excel + ";Extended Properties=Excel 12.0;")
dta = New OleDbDataAdapter("Select * From [Sheet1$]", conn)
dts = New DataSet
dta.Fill(dts, "[Sheet1$]")
DataGridView1.DataSource = dts
DataGridView1.DataMember = "[Sheet1$]"
conn.Close()
End If
End Sub
Private Class ButtonCreateData
Public Shared Property Text As String
Public Shared Property Enabled As Boolean
End Class
End Class
Class DataGridItem
Private v1 As Integer
Private v2 As Integer
Private header As Object
Public Sub New(v1 As Integer, v2 As Integer, header As Object)
Me.v1 = v1
Me.v2 = v2
Me.header = header
End Sub
Friend Function Cells() As Object
Throw New NotImplementedException()
End Function
End Class
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Visual Basic is a event driven programming language by Microsoft, first released in the year 1991.
Variable is a name given to the storage area in order to identify them in our programs.
Simple syntax of Variable declaration is as follows
Dim variableName [ As [ New ] dataType ] [ = initializer ]
variableName = value
If condition-expression Then
'code
End If
If(conditional-expression)Then
'code if the conditional-expression is true
Else
'code if the conditional-expression is false
End If
If(conditional-expression)Then
'code if the above conditional-expression is true
Else If(conditional-expression) Then
'code if the above conditional-expression is true
Else
'code if the above conditional-expression is false
End If
If(conditional-expression)Then
'code if the above conditional-expression is true
If(conditional-expression)Then
'code if the above conditional-expression is true
End If
End If
Select [ Case ] expression
[ Case expressionlist
'code ]
[ Case Else
'code ]
End Select
For counter [ As datatype ] = begin To end [ Step step ]
'code
[ Continue For ]
'code
[ Exit For ]
'code
Next [ counter ]
For Each element [ As datatype ] In group
'code
[ Continue For ]
'code
[ Exit For ]
'code
Next [ element ]
While conditional-expression
'Code
[ Continue While ]
'Code
[ Exit While ]
'Code
End While
Do { While | Until } conditional-expression
'Code
[ Continue Do ]
'Code
[ Exit Do ]
'Code
Loop
Do
'Code
[ Continue Do ]
'Code
[ Exit Do ]
'Code
Loop { While | Until } conditional-expression
Procedure is a sub-routine which contains set of statements. Usually Procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Procedures are of two types.
Functions return a value when they are called.
[accessModifiers] Function functionName [(parameterList)] As returnType
'code
End Function
Sub-procedures are similar to functions but they don't return any value.
Sub ProcedureName (parameterList)
'Code
End Sub