View data from database using textbox

问题

I have made some format in my access database,but when i try to view in textbox it not view the value using the format that i have set it. I use vb.net as a programming language and ms access as a database

Access database :

Field Name : sampleID Data Type : AutoNumber Format : "000000"

VB.net code :

sql = "SELECT * FROM Cleaning"
    cmd = New OleDbCommand(sql, cnnOLEDB)
    cnnOLEDB.Open()

    Dim dr As OleDbDataReader
    dr = cmd.ExecuteReader()
    While dr.Read()

        txtSampleID.Text = dr("sampleID").ToString()

    End While
    dr.Close()

output in textbox after run program= 14

the actual output that i want to view is 000014

回答1:

That's because the value being returned from sql is an integer, not a string. You can change your code to re-format it the way you want:

    txtSampleID.Text = Cint(dr("sampleID")).ToString("00000#")

回答2:

sql = "SELECT * FROM Cleaning"
cmd = New OleDbCommand(sql, cnnOLEDB)
cnnOLEDB.Open()

Dim dr As OleDbDataReader
dr = cmd.ExecuteReader()
While dr.Read()

   txtSampleID.Text = Cint(dr("sampleID")).ToString("00000#")
End While
dr.Close()

来源：https://stackoverflow.com/questions/13152534/view-data-from-database-using-textbox