How can I make a TextBox in a GridView not fire TextChanged when SelectedIndexChanged is fired?

I have a TextBox in a TemplateField in a GridView that is supposed to show a checkmark after its TextChanged event.

I also made the GridView row selectable. If I select a row, the entire GridView rebinds and fires the TextChanged event for all TextBoxes in the GridView. This, of course, displays all the checkmarks.

I don't want to display the checkmarks on any rows the user did not change. I think the best wa开发者_运维百科y to do this is to prevent (unattach?) the TextChanged event unless the user changes the text value.

Any suggestions?

I'm not sure if i've understood your problem actually because you haven't provided any source-code, but i try to give an answer anyway.

There are several options to avoid this behaviour:

1. set the TextBox' AutoPostback-Property to true. On this way the TextChanged-Event will occur directly after the user entered something into the Textbox and presses Enter or leaves the Textbox' focus
2. You should hide the CheckMarks by default(Visible="false")
3. You must not rebind the GridView OnSelectedIndexChanging but only set it's SelectedIndex to e.NewSelectedIndex. On this way the Text of the Textboxes which was already been changed by the user will not be overwritten from the old db-values

Here's a simple example to demontrate what i mean:

<asp:gridview id="GridView1" runat="server" autogeneratecolumns="False" AutoGenerateSelectButton="true" OnSelectedIndexChanging="GridSelecting" OnRowDataBound="GridRowDataBound" >  
    <SelectedRowStyle BackColor="LightBlue" />
    <columns>   
        <asp:TemplateField>
            <ItemTemplate>
               <asp:CheckBox ID="CheckMark" Checked="true" Enabled="false" visible="false" runat="server" />
               <asp:TextBox ID="Textbox1" runat="server" AutoPostBack="false" OnTextChanged="TextChanged"></asp:TextBox>
            </ItemTemplate>
       </asp:TemplateField>         
    </columns>
</asp:gridview> 

Codebehind:

protected void Page_Load(object sender, System.EventArgs e)
{
    if (!IsPostBack) {
        BindGrid();
    }
}

private void BindGrid()
{
    DataTable source = new DataTable();
    source.Columns.Add(new DataColumn("Value", typeof(string)));
    DataRow row = source.NewRow();
    row["Value"] = "A";
    source.Rows.Add(row);
    row = source.NewRow();
    row["Value"] = "B";
    source.Rows.Add(row);
    row = source.NewRow();
    row["Value"] = "C";
    source.Rows.Add(row);
    this.GridView1.DataSource = source;
    this.GridView1.DataBind();
}

protected void TextChanged(object sender, EventArgs e)
{
    var chk = ((TextBox)sender).NamingContainer.FindControl("CheckMark");
    chk.Visible = true;
}

protected void GridSelecting(object sender, GridViewSelectEventArgs e)
{
    this.GridView1.SelectedIndex = e.NewSelectedIndex;
}

Note: I'm sure that the original OP meanwhile has found the answer or a workaround by himself, maybe it'anyway helpful for someone else to see the differences between this simplified working sample and his own code