[Solved] Date field appending time when exporting data to CSV in Windows Forms Application using C#

This is happening because you are exporting everything as string. Try making the column as DateTime in DataGridView.

Thank You sir.I got date format in csv using Convert.ToDateTime().

        Dim saveFileDialog1 As New SaveFileDialog()
        saveFileDialog1.FileName = "POdetails"
        saveFileDialog1.Filter = "CSV|*.csv"
        saveFileDialog1.Title = "Export As"
        saveFileDialog1.ShowDialog()
        'build the csv file data as a Comma seperated string
        Dim csv As String = String.Empty

        'Add the Header row for CSV file
        For Each column As DataGridViewColumn In purchaseorderDGV.Columns
            csv += column.HeaderText & ","c
        Next

        'Add new line
        csv += vbCr & vbLf

        'Adding the Rows
        For Each row As DataGridViewRow In purchaseorderDGV.Rows
            For Each cell As DataGridViewCell In row.Cells
                If cell.ColumnIndex <> 1 Then
                    csv += cell.Value.ToString.Replace(",", ";") & ","c
                Else
                    csv += Convert.ToDateTime(cell.Value.ToString.Replace(",", ";")) & ","c
                End If

            Next
            csv += vbCr + vbLf

        Next

        'Exporting as csv
        System.IO.File.WriteAllText(saveFileDialog1.FileName, csv)