Reputation: 1804

ASP.NET C# trying to hide a link button

I am somewhat new to ASP.NET and I am confused by the syntax so I am a little lost. I am trying to hide/disable a button based on an if statement but I dont know how to disable or hide it. I have done C# before but this code looks unfamiliar to me.

Below is some of the code:

C# component:

  protected override void Render(HtmlTextWriter writer)
  {    
     string PostCtrl = Request.Params["__EVENTTARGET"];

     if (PostCtrl == "AccColLocation_content$collisionLocation$EditColLocation")
     {
          valDropDownlist(((CustomControl.DropDownValidator)collisionLocation.FindControl("valLoc_municipality")), "CollisionLocation.municipality");

            ..............    
     }    
  }

HTML:

 <ItemTemplate>
<asp:LinkButton ID="EditColLocation" runat="server" Text="Edit Collision Location" OnClick="CollisionLocation_Edit" />
 </ItemTemplate>

valDropDownList Method:

protected void valDropDownlist(CustomControl.DropDownValidator valDropdown, string DataElement)
{
    try
    {
        bool mvarRequired, srRequired;
        DataTable dtDataElement = DBFunctions.DBFunctions.getDataElement(RepDateTime, DataElement);
        string s = dtDataElement.Rows[0]["mvarRequired"].ToString();
        mvarRequired = (dtDataElement.Rows[0]["mvarRequired"].ToString() == "True") ? true : false;
        srRequired = (dtDataElement.Rows[0]["srRequired"].ToString() == "True") ? true : false;
        valDropdown.HaveToSelect = (SelfReported) ? srRequired : mvarRequired;
    }
    catch (Exception err)
    {
        MessageBox("An error occurred while setting drop down validation rules. " + err.ToString());
    }
}

All these buttons are in grid view.

I have something of this nature:

protected void deletedr(object sender, EventArgs e)
    {
        try
        {
            GridView gv = (GridView)FindControl("DriverInfo");
            gv.DataSource = DBFunctions.DBFunctions.getInfo(ReportID.Value, "", 2); ;
            gv.DataBind();

            bool isSelectedLast = false;
            DataTable dt = DBFunctions.DBFunctions.getInfo(ReportID.Value, "", 2);

            if (dlDriverNo.SelectedValue == dt.Rows[dt.Rows.Count - 1]["DriverNo"].ToString())
            {
                isSelectedLast = true;
            }

            if (!(DBFunctions.DBFunctions.deleteDriver(ReportID.Value, dlDriverNo.SelectedValue, isSelectedLast)))
            {
                MessageBox(null);
            }
            else
            {
                dlDriverNo.Visible = false;
                lblDelDriver.Visible = false;
                delDriverconfim.Visible = false;
                cancelDel.Visible = false;
                dlDriverNo.Items.Clear();
                gv.DataSource = DBFunctions.DBFunctions.getInfo(ReportID.Value, "", 2);
                gv.DataBind();
            }
        }
        catch (Exception err)
        {
            MessageBox("An error occurred while deleting the driver. " + err.ToString());
        }
    }

Upvotes: 0

Answers (3)

user1429080

Reputation: 9166

If your LinkButton is in a GridView, the most interesting problem is getting a handle on it. After you have a handle you can just set it to invisible or disabled:

linkButton.Visible = false;

linkButton.Enabled = false;

But to get a handle to the LinkButton control you will need to use .FindControl in a suitable event on the GridView control:

<asp:GridView ID="myGridView" runat="server" OnRowDataBound="myGridView_RowDataBound">
...
</aspGridView>

Then in the code behind you would have:

protected void myGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
    var linkButton = (LinkButton)e.Row.FindControl("EditColLocation");
    if (linkButton != null) 
    {
        if (*your condition to check*)
            linkButton.Visible = false; 
    }
}

Hope this will get you moving in the right direction.

Upvotes: 5