Hello,
I have created a site in VB.Net and ASP.Net where a user types in a centre code and clicks on 2 buttons to retreive 2 GridView's of records from an SQL Server backend database.
The records appear sucessfully, but when I go to sort the records in ascending/descending order, nothing happens.
I have been trying this for a week now, but with no success.
The code I have is the following:
<script runat="server" >
Public Sub Button2_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button2.Click
Dim sqlConn As New SqlConnection
Dim sqlCmd As New SqlClient.SqlCommand
Dim sqlReader As SqlDataReader
Dim sqlAdapter As New SqlDataAdapter
Dim sqlDataTable As New DataTable
'If no values are supplied in the textbox, throw an error message.
If TextBox2.Text = "" Then
MsgBox("A centre code needs to be provided...")
End If
If TextBox2.Text <> "" Then
'Telling the system the location of the database.
sqlConn.ConnectionString = "server=ServerName;Initial Catalog=DBName;Trusted_Connection=yes"
'Here we are opening the connection to the database.
sqlConn.Open()
'This is to say that sqlCmd is a stored procedure.
sqlCmd.CommandType = System.Data.CommandType.StoredProcedure
'This is creating the command to execute the stored procedure based on the information given in the connection string.
sqlCmd = sqlConn.CreateCommand
'The command is triggered to execute the stored procedure which grabs all information for the specific centre.
sqlCmd.CommandText = "exec ProcName'" & TextBox2.Text & "' "
'This will read the rows in the database.
sqlReader = sqlCmd.ExecuteReader()
'If there are rows of data that match are criteria
If (sqlReader.HasRows) Then
'The rows of data are grabbed for the specific centre from the database using the data reader.
GridView1.DataSource = sqlReader
GridView1.DataBind()
Else
MsgBox("The centre code provided does not exist...")
End If
'This is closing the connection to the database once we have finished with it.
sqlConn.Close()
End If
End Sub
Public Sub Button3_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button3.Click
Dim sqlConn As New SqlConnection
Dim sqlCmd As New SqlClient.SqlCommand
Dim sqlReader As SqlDataReader
Dim sqlAdapter As New SqlDataAdapter
Dim sqlDataTable As New DataTable
'If no values are supplied in the textbox, throw an error message.
If TextBox2.Text = "" Then
MsgBox("A centre code needs to be provided...")
End If
If TextBox2.Text <> "" Then
'Telling the system the location of the database.
sqlConn.ConnectionString = "server=ServerName;Initial Catalog=DBName;Trusted_Connection=yes"
'Here we are opening the connection to the database.
sqlConn.Open()
'This is to say that sqlCmd is a stored procedure.
sqlCmd.CommandType = System.Data.CommandType.StoredProcedure
'This is creating the command to execute the stored procedure based on the information given in the connection string.
sqlCmd = sqlConn.CreateCommand
'The command is triggered to execute the stored procedure which grabs all information for the specific centre.
sqlCmd.CommandText = "exec ProcName'" & TextBox2.Text & "' "
'This will read the rows in the database.
sqlReader = sqlCmd.ExecuteReader()
'If there are rows of data that match are criteria
If (sqlReader.HasRows) Then
'The rows of data are grabbed for the specific centre from the database using the data reader.
GridView2.DataSource = sqlReader
GridView2.DataBind()
'GridView2.DataSource = sqlDataTable
Else
MsgBox("The centre code provided does not exist...")
End If
'This is closing the connection to the database once we have finished with it.
sqlConn.Close()
End If
End Sub
Public Sub gvSorting_Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs)
Dim dtSortView As New DataTable
dtSortView = GridView2.DataSource
If Not dtSortView Is Nothing Then
Dim dvSortedView As New DataView(dtSortView)
dvSortedView.Sort = e.SortExpression + " " + getSortDirectionString(e.SortDirection)
GridView2.DataSource = dvSortedView
GridView2.DataBind()
Else
MsgBox("No data to select")
End If
End Sub
Public Function getSortDirectionString(ByVal SortDirection As SortDirection) As String
Dim newSortDirection As String = String.Empty
If (SortDirection = SortDirection.Ascending) Then
newSortDirection = "ASC"
Else
newSortDirection = "DESC"
End If
Return newSortDirection
End Function
</script>My GridView declaration is the following:
<asp:GridView ID="GridView2" runat="server" Height="143px" AllowSorting="true" OnSorting="gvSorting_Sorting"If anyone can advise on what I am doing wrong and where...it would be much appreciated.
Many thanks,
Dan