Help Creating an Error Handler

Question

HEllo Everyone:

I am new in VB2005, with no programming experience. I am working on a project whith a search screen where I have multiples combo boxes, text boxes and so far everything is working the way I want it, meaning I can search using any of the combo boxes.  The problem I am having is that I don't know how to write an Error Handler. I want to be able that if my criteria doesn't match to display a message "No Record Found". Please help

BK.

 

Here is copy of the code that I have for my serach screen.

*****************************************************

 Private Sub get_searchtable_records()
        Dim conn As New SqlClient.SqlConnection
        Dim searchtable_string As String = ""
        Dim searchtable_string2 As String = ""

        'Dim strWhereCondition As String

        Dim testsearch_connection As New SqlClient.SqlConnection("Persist Security Info=False;Integrated Security=SSPI;database=SupportDesk;server=local")

        searchtable_string = "SELECT * FROM CallLog" & trimstring
        searchtable_string2 = "" & trimstring

        'This is to search using the Priority Combo Box
        If Trim(CmbSrPriority.Text) <> "" Then
            If searchtable_string2 = "" Then
                searchtable_string2 = " WHERE Priorityid = '" & CmbSrPriority.Text & "' "
            Else
                searchtable_string2 = searchtable_string2 & " AND Priorityid = '" & CmbSrPriority.Text & "' "
            End If
        End If
        '*************************
        'This is to search using the Status Combo Box
        If Trim(CmbSrStatus.Text) <> "" Then
            If searchtable_string2 = "" Then
                searchtable_string2 = " WHERE Statusid = '" & CmbSrStatus.Text & "' "
            Else
                searchtable_string2 = searchtable_string2 & " AND Statusid = '" & CmbSrStatus.Text & "' "
            End If
        End If
        '*************************
        'This is to search using the District Combo Box
        If Trim(CmbSrDistrict.Text) <> "" Then
            If searchtable_string2 = "" Then
                searchtable_string2 = " WHERE DistrictNumberID = '" & CmbSrDistrict.Text & "' "
            Else
                searchtable_string2 = searchtable_string2 & " AND DistrictNumberID = '" & CmbSrDistrict.Text & "' "
            End If
        End If
        '*************************
        'This is to search using the Application Combo Box
        If Trim(CmbSrApplication.Text) <> "" Then
            If searchtable_string2 = "" Then
                searchtable_string2 = " WHERE Applicationid = '" & CmbSrApplication.Text & "' "
            Else
                searchtable_string2 = searchtable_string2 & " AND Applicationid = '" & CmbSrApplication.Text & "' "
            End If
        End If
        '*************************
        'This is to search using the Group Combo Box
        If Trim(CmbSrGroup.Text) <> "" Then
            If searchtable_string2 = "" Then
                searchtable_string2 = " WHERE Groupid = '" & CmbSrGroup.Text & "' "
            Else
                searchtable_string2 = searchtable_string2 & " AND Groupid = '" & CmbSrGroup.Text & "' "
            End If
        End If
        '*************************
        'This is to search using the Assignee Combo Box
        If Trim(CmbSrAssignee.Text) <> "" Then
            If searchtable_string2 = "" Then
                searchtable_string2 = " WHERE Assigneeid = '" & CmbSrAssignee.Text & "' "
            Else
                searchtable_string2 = searchtable_string2 & " AND Assigneeid = '" & CmbSrAssignee.Text & "' "
            End If
        End If
        
        '*********************************       
        'This is to search using the Call Description Combo Box
        If Trim(TxtSrCallDescription.Text) <> "" Then
            If searchtable_string2 = "" Then
                searchtable_string2 = " WHERE RichTextBox1 LIKE '%" & TxtSrCallDescription.Text & "%' "
            Else
                searchtable_string2 = searchtable_string2 & " AND RichTextBox1 LIKE '%" & TxtSrCallDescription.Text & "%' "
            End If
        End If
        '*************************
        'This is to search using the Call Resolution Combo Box
        If Trim(TxtSrCallResolution.Text) <> "" Then
            If searchtable_string2 = "" Then
                searchtable_string2 = " WHERE RichTextBox2 LIKE '%" & TxtSrCallResolution.Text & "%' "
            Else
                searchtable_string2 = searchtable_string2 & " AND RichTextBox2 LIKE '%" & TxtSrCallResolution.Text & "%' "
            End If
        End If
        '*************************
        searchtable_string = searchtable_string & searchtable_string2

        searchtable_command = New SqlClient.SqlCommand(searchtable_string, testsearch_connection)

        searchtable_dataadapter = New SqlClient.SqlDataAdapter(searchtable_command)

        If searchtable_command.Connection.State = ConnectionState.Closed Then

            searchtable_command.Connection.Open()

        End If

        searchtable_table.Clear()
        'clear table to not show duplicates after refilling

        searchtable_dataadapter.Fill(searchtable_table)

        searchtable_command.Connection.Close()

        Me.DataGridView1.DataSource = searchtable_table

    End Sub