Error on form close. error converting datatype varchar to numeric. The error is on line dr.Read

Question

2.00/5 (1 vote)

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SQL-Server-2012

C#

Private Sub btstfidcmb_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles btstfidcmb.SelectedIndexChanged
       Dim con As New SqlConnection("Data Source=ASHUTOSH-PC\SQLEXPRESS;Initial Catalog=Art Station Management System;Integrated Security=True")
       Dim com As SqlCommand
       Dim dr As SqlDataReader
       'Dim s = CInt(btstfidcmb.Text)
       Try
           con.Open()
           Dim str As String
           str = "select * from StaffRegister where stfstaffid = '" & btstfidcmb.Text & "'"
           com = New SqlCommand(str, con)
           dr = com.ExecuteReader
           While dr.Read
               stfnametxt.Text = dr.GetString(1)
               stfmnametxt.Text = dr.GetString(2)
               stflnametxt.Text = dr.GetString(3)
           End While
           con.Close()
       Catch ex As SqlException
           MessageBox.Show(ex.Message)
       End Try
   End Sub

Posted 25-Dec-15 8:32am

Ashutosh Dutondkar

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ZurdoDev · Accepted Answer · 2015-12-26T17:42:00

Solution 1

This is a very simple error that you could fix on your own within seconds if you know how to debug. Put a breakpoint on the line com= New SqlCommand(str, con) and I'll bet you that your variable str has "where stfstaffid = ''" or some other non-numeric value in btstfidcmb.Text.

All you have to do is fix that.

Posted 26-Dec-15 17:42pm

ZurdoDev

Comments

Ashutosh Dutondkar 27-Dec-15 4:45am

Actually, my mistake was, I was having a numeric data type and was trying to convert to string by putting ''. But instead of '=' is I have put 'like' command for comparing the string and my error is solved now. Thanks for your Help Sir! :)

ZurdoDev 27-Dec-15 9:48am

Glad you were able to get it worked out.