How to call function from button located in GridView?

I have a GridView on my page and single column of this view consists of buttons. On clicking these buttons, I want a method to be called which is located at code behind page. I have tried, OnClick of button and OnRowCommand of GridView. However, I still cannot call the function from code behind page.

This is my GridView.

<asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1" 
    CssClass="formx2" AutoGenerateColumns="False" DataKeyNames="companyName"  >
    <Columns>
        <asp:TemplateField HeaderText="Düzenle" SortExpression="companyName" 
       开发者_C百科     HeaderStyle-CssClass="colDept">      
            <ItemTemplate>
                <asp:Button runat="server" ID="IncreaseButton" Text="Düzenle" 
                    CommandName="Select" CommandArgument="something" 
                    CssClass="accordionHeader" BorderColor ="White" 
                    Onclick="redirect"/>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

And my code behind method,

protected void redirect(object sender, EventArgs e)
{
    TextBox1.Text = "test";
}

Help would be greatly appreciated, I really stuck at this point.

Thanks in advance.

---

Something like this

<asp:TemplateField HeaderText="Düzenle" SortExpression="companyName" HeaderStyle-CssClass="colDept">
 <ItemTemplate>
   <asp:Button ID="IncreaseButton" runat="server" 
    CommandName="Select" 
    CommandArgument="<%# CType(Container,GridViewRow).RowIndex %>"
     />
 </ItemTemplate> 
</asp:TemplateField>

and then code behind

Protected Sub GridView1_RowCommand(ByVal sender As Object, _
  ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs)
  If (e.CommandName = "Select") Then
    // Retrieve the row index stored in the CommandArgument property.
    Dim index As Integer = Convert.ToInt32(e.CommandArgument)

    // Retrieve the row that contains the button 

    Dim row As GridViewRow = GridView1.Rows(index)

    // Add code here 
  End If
 End Sub