Question

Bind data to a gridview using datareader

Asked by: Neste

Hi there, i am trying to Read some data from the db and bind it to gridview using datareader, i think my code should be right but anyway i don't get the data binded to the gridview and i don't get any errors...

Here is my code...

<table class="style1">
        <tr>
            <td class="style4">
                <asp:Label ID="lblSearch" runat="server" Text="Search:"></asp:Label>
            </td>
            <td class="style3">
                <asp:TextBox ID="txtSearch" runat="server" style="margin-left: 0px" 
                    Width="250px"></asp:TextBox>
            </td>
            <td class="style5">
                <asp:Button ID="btnSearch" runat="server" Text="Submit" />
            </td>
            <td>
                <asp:RequiredFieldValidator ID="rvSearch" runat="server" 
                    ErrorMessage="Field is required!" ControlToValidate="txtSearch"></asp:RequiredFieldValidator>
            </td>
        </tr>
        <tr>
            <td class="style2" colspan="4">
                &nbsp;</td>
        </tr>
        <tr>
            <td class="style2" colspan="4">
                <asp:GridView ID="gvSearch" AutoGenerateColumns="false" runat="server">
                </asp:GridView>
            </td>
        </tr>
    </table>
--------------------------------------
    Protected Sub btnSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSearch.Click
        Search()
    End Sub
    Sub Search()
 
        Dim strSearch As String = txtSearch.Text
 
        Dim MyConn As OleDbConnection = New OleDbConnection(ConfigurationManager.AppSettings("strConn"))
        Dim MySQL As String = "SELECT * FROM [tblTopics] WHERE [tblTopics.TopicSubject] = @TopicSubject"
        Dim MyCmd As New OleDbCommand(MySQL, MyConn)
 
        With MyCmd.Parameters
            .Add(New OleDbParameter("@TopicSubject", strSearch))
        End With
 
        MyConn.Open()
 
        Dim objDataReader As OleDbDataReader = MyCmd.ExecuteReader()
 
        gvSearch.DataSource = objDataReader
        gvSearch.DataBind()
 
        MyConn.Close()
 
    End Sub
End Class

                                  
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Asked On
2009-04-12 at 13:18:51ID24316016
Tags

Databinding

,

ASP.NET

,

Data Reader

Topics

Programming for ASP.NET

,

Microsoft Access Database

,

Microsoft Visual Basic.Net

Participating Experts
3
Points
125
Comments
7

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Answers

 

by: angelIIIPosted on 2009-04-12 at 13:21:43ID: 24126789

why a datareader?

    Sub Search()
 
        Dim strSearch As String = txtSearch.Text
 
        Dim MyConn As OleDbConnection = New OleDbConnection(ConfigurationManager.AppSettings("strConn"))
        Dim MySQL As String = "SELECT * FROM [tblTopics] WHERE [tblTopics.TopicSubject] = @TopicSubject"
        Dim MyCmd As New OleDbCommand(MySQL, MyConn)
 
        With MyCmd.Parameters
            .Add(New OleDbParameter("@TopicSubject", strSearch))
        End With 
        MyConn.Open() 
        Dim MyAdapter as New DataAdapter(MyCmd)
        Dim Mydataset as New DataSet()
        MyAdapter.Fill(mydataset)  
        gvSearch.DataSource = mydataset
        gvSearch.DataBind()
 
        MyConn.Close()
 
    End Sub

                                              
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by: NestePosted on 2009-04-12 at 22:54:23ID: 24128141

Cant make it work whit your code, the gridview is still empty when i click the button :(

Any ideas ?

 

by: NestePosted on 2009-04-12 at 23:33:12ID: 24128212

Please any help is more then welcome, i really need to have this done in 2 days...thanks

 

by: angelIIIPosted on 2009-04-12 at 23:35:13ID: 24128217

did you define the bound columns definitions in the gridview already?

 

by: apramodPosted on 2009-04-13 at 00:50:48ID: 24128443

From the above code what i find is you have not defined bound columns in your gridview. You are getting data but u need to bind those columnd definations in gridview.
Ex:
asp:GridView ID="gvSearch" runat="server" AllowPaging="true" AutoGenerateColumns="False"
                    OnPageIndexChanging="grdLanguage_PageIndexChanging" OnSelectedIndexChanged="grdLanguage_SelectedIndexChanged"
                    >
                    <Columns>
<asp:BoundField DataField="Search" HeaderText="Language" SortExpression="SearchName" ItemStyle-HorizontalAlign="left" >
                            <ItemStyle HorizontalAlign="Left"></ItemStyle>
</asp:BoundField>
</Columns>
                </asp:GridView>

 

by: havj123Posted on 2009-04-13 at 02:25:11ID: 24128647

The better way is to use dataset instead of datareader to fill a gridview.

I think the problem is in the quesry

"SELECT * FROM [tblTopics] WHERE [tblTopics.TopicSubject] = @TopicSubject"

 

by: apramodPosted on 2009-04-13 at 03:02:37ID: 24128733

Even though if you use dataset to bind to gridview you need to bind the colums to gridview by using "BoundField" where you will bind the columns you want to see in grid, without that you will not see the columns.

20120131-EE-VQP-002

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