Hello friends, hope you guys are dong well.
problem again and really looking up to my expert friends here.
I'm new and trying to write Edit code in VB.NET. the problem is
Select * From Application Where Sl_No='" + txteditno.Text + "'", con)
is not displaying and record although it works if i remove the WHERE part in my select statement....plz examinemy code...thanks

Private Sub Formedit_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        strc = "Provider = Microsoft.Jet.OLEDB.4.0;Data Source=J:\Alumni\Alumni\Alumni\aadb.mdb"
        con = New OleDbConnection(strc)
        txteditno.Text = n
        'da = New OleDbDataAdapter("Select * From Application Where Sl_No='" + txteditno.Text + "'", con)

       
        'ds = New DataSet()
        'da.Fill(ds, "Application")
        cmd1 = New OleDbCommand("Select * From Application ", con)
        ds = New DataSet()


        dt = ds.Tables("Application")
        txtslno.DataBindings.Add("Text", dt, "Sl_No")
        txtname.DataBindings.Add("Text", dt, "Name")
        txtdob.DataBindings.Add("Text", dt, "Date_of_birth")
        txtgender.DataBindings.Add("Text", dt, "Gender")
        txtdegree.DataBindings.Add("Text", dt, "Degree_obtained")
        txtenroll.DataBindings.Add("Text", dt, "Year_of_Enrollment")
        txtpass.DataBindings.Add("Text", dt, "Year_of_passing")
        txtpadd.DataBindings.Add("Text", dt, "Permanent_Address")
        txtpin.DataBindings.Add("Text", dt, "PIN_Code")
        txtphone.DataBindings.Add("Text", dt, "Phone_No")
        txtmobile.DataBindings.Add("Text", dt, "Mobile_No")
        txtemail.DataBindings.Add("Text", dt, "Email_Id")

        con.Close()
        con = Nothing
    End Sub

you this line is wrong that's whi it's not working
''da = New OleDbDataAdapter("Select * From Application Where Sl_No='" + txteditno.Text + "'", con)
in VB.net we are not concatenation string with '+' sign we are use '& '.
so instead of this write like this

da = New OleDbDataAdapter("Select * From [Application] Where [Sl_No] ='" & trim(txteditno.Text) & " '",con)

Thanks Pritesh2010 and Finito

Ok, so I take the value of txteditno.text from and InputBox and tried running the program, taking you suggestion of using OLEDBCommand and using & instead of + but the problem still persist…I get the following error.
ArguementNullException was Unhandled
Value cannot be null.
Parameter name: dataSource

My database is MSAccess and Sl_No is Autonumber...m still trying to get it right but really will appreciate help

My code to modify record after displaying the records using a code.

Private Sub btnmodify_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnmodify.Click
        con = New OleDbConnection(strc)
        con.Open()
        str = "UPDATE Application SET Name='" & Trim(txtname.Text) & "',Date_of_birth='" & Trim(txtdob.Text) & "',Gender='" & Trim(txtgender.Text) & "',Degree_obtained='" & Trim(txtdegree.Text) & "',Year_of_Enrollment='" & Trim(txtenroll.Text) & "',Year_of_passing='" & Trim(txtpass.Text) & "',Permanent_Address='" & Trim(txtpadd.Text) & "',PIN_Code='" & Trim(Val(txtpin.Text)) & "',Phone_No='" & Trim(Val(txtphone.Text)) & "',Mobile_No='" & Trim(Val(txtmobile.Text)) & "',Email_Id='" & Trim(txtemail.Text) & "' WHERE Mobile_No ='" + n + "'"
        cmd1 = New OleDbCommand(str, con)
        cmd1.ExecuteNonQuery()
        con.Close()
        con = Nothing
    End Sub

This is the CODE to display the records after searching the database by its Serial No. which is entered through txteditno.text.

Private Sub btnsearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnsearch.Click
        strc = "Provider = Microsoft.Jet.OLEDB.4.0;Data Source=J:\Alumni\Alumni\Alumni\aadb.mdb"
        con = New OleDbConnection(strc)
        con.Open()
        cmd1 = New OleDbCommand("Select * From [Application] Where [Sl_No]='" & Val(txteditno.Text) & "'", con)
        ds = New DataSet("Application")
        dt = New DataTable
        Dim dv As DataView
        'dt = ds.Tables("Application")
        dv = New DataView(ds.Tables("Application"))

        txtslno.DataBindings.Add("Text", dv, "Sl_No")
        txtname.DataBindings.Add("Text", dv, "Name")
        txtdob.DataBindings.Add("Text", dv, "Date_of_birth")
        txtgender.DataBindings.Add("Text", dv, "Gender")
        txtdegree.DataBindings.Add("Text", dv, "Degree_obtained")
        txtenroll.DataBindings.Add("Text", dv, "Year_of_Enrollment")
        txtpass.DataBindings.Add("Text", dv, "Year_of_passing")
        txtpadd.DataBindings.Add("Text", dv, "Permanent_Address")
        txtpin.DataBindings.Add("Text", dv, "PIN_Code")
        txtphone.DataBindings.Add("Text", dv, "Phone_No")
        txtmobile.DataBindings.Add("Text", dv, "Mobile_No")
        txtemail.DataBindings.Add("Text", dv, "Email_Id")

        con.Close()
        con = Nothing

This code is not working and shows ERROR:
Cannot bind to the property or column Sl_No on the DataSource.
Parameter name: dataMember

This means one of the values you are calling is NULL.

SELECT WHEN CASE DOB IS NULL THEN '19750608' ELSE DOB END FROM Application

.

This is a sample code where you are checking if column DOB is NULL, if it is NULL then you give it a standard value in this case '19750608' in yyyyMMdd format or however you want to.

Actually have dont input validation before the SQL qry.

If (txtname.Text = "") Then
            MessageBox.Show("Name field cannot be blank, Please enter the name.", "Error", MessageBoxButtons.OK)
            txtname.Focus()
            Exit Sub
        Else
            If (IsNumeric(txtname.Text)) Then
                MessageBox.Show("Please enter a valid name. eg: Jack, Bryan", "Error", MessageBoxButtons.OK)
                txtname.Focus()
                Exit Sub
            End If
        End If

Cannot bind to the property or column Sl_No on the DataSource.
Parameter name: dataMember

Which Line?

Ok I see the error.

txtslno.DataBindings.Add("Text", [B]ds[/B], "[B]Application[/B].Sl_No")

if this doesn't work try adding [] to Application.

what if i want to make it in adapter??how can i do that sir?

Edited 4 Years Ago by nicolle john: wrong grammar

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