ASP.Net - need to click a button from the code-behind so I can pop an error message

Question

Inherited an asp.net 3.5 C# site. Main page has a control in it that has a datagrid-if the user fails to put a file name and hits 'update', it's wrong-they have to supply a file name. They also have some custom business logic that I nicely have in the code behind. Any of these could mean the user needs to see an error at which point I cancel out of the SqlDataSource update, thus, reverting the grid back to its original value, fine...however, if I put an error message up in a text box(already did that), now, the user is staring at an error msg...I'd rather pop up a warning / error, and then it's all fixed.

SO.....I have the error in a hiddenfield...now, how can I force a click of a hidden button so I can alert the client?

Win · Accepted Answer · 2011-08-03 14:45:26Z

1

The following is the code which validates the user input at code behind, and prompt a message if invalid.

// ASPX page
<asp:TextBox runat="server" ID="FileNameTextBox"></asp:TextBox>
<asp:Button runat="server" ID="SubmitButton" Text="Submit" OnClick="SubmitButton_Click" />

// Code behind
protected void SubmitButton_Click(object sender, EventArgs e)
{
    if (string.IsNullOrEmpty(FileNameTextBox.Text))
    {
        string script = string.Format("alert('File name is required.')");

        ScriptManager.RegisterStartupScript(Page, typeof(Page), "Validation" + UniqueID, script, true);
    }
}

enter image description here

answered Aug 3, 2011 at 14:45

Win

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Comments

sll · Accepted Answer · 2011-08-03 12:02:47Z

0

To validate file name textbox you can use RequiredFieldValidator
To notify about custom logic error you can use CustomValidator

How to trigger it from code behind: see here

answered Aug 3, 2011 at 12:02

sll

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