In this article I will explain with an example, how to use the ClientScript.RegisterOnSubmitStatement function for displaying MessageBox from Server-Side (Code-Behind) in ASP.Net using C# and VB.Net.
This article will explain how to use the ClientScript.RegisterOnSubmitStatement function for displaying:
1.
JavaScript Alert
MessageBox on Page Load event.
2.
JavaScript Confirmation Box on Button Click event.
Displaying MessageBox using ClientScript.RegisterOnSubmitStatement in Page Load
Inside the
Page_Load event handler, the following
JavaScript function will be registered using the
RegisterOnSubmitStatement function.
Registered
JavaScript function will look like as shown below on
Source page
![Using ClientScript.RegisterOnSubmitStatement in ASP.Net]()
The below
JavaScript function will display a message to the user when the user submits the Form.
C#
protected void Page_Load(object sender, EventArgs e)
{
string message = "Form has been submitted.";
StringBuilder sb = new StringBuilder();
sb.Append("alert('");
sb.Append(message);
sb.Append("');");
ClientScript.RegisterOnSubmitStatement(this.GetType(), "alert", sb.ToString());
}
VB.Net
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
Dim message As String = "Form has been submitted."
Dim sb As StringBuilder = New StringBuilder()
sb.Append("alert('")
sb.Append(message)
sb.Append("');")
ClientScript.RegisterOnSubmitStatement(Me.GetType(), "alert", sb.ToString())
End Sub
Screenshot
![Using ClientScript.RegisterOnSubmitStatement in ASP.Net]()
Displaying Confirmation Box using ClientScript.RegisterOnSubmitStatement on Button Click
Inside the
Page_Load event handler, the following
JavaScript function will be registered using the
RegisterOnSubmitStatement function.
Registered
JavaScript function will look like as shown below on
Source page
![Using ClientScript.RegisterOnSubmitStatement in ASP.Net]()
The below
JavaScript function will display a
JavaScript Confirmation
MessageBox to the user when user submits the Form.
C#
protected void Page_Load(object sender, EventArgs e)
{
string message = "Do you want to Submit?";
StringBuilder sb = new StringBuilder();
sb.Append("return confirm('");
sb.Append(message);
sb.Append("');");
ClientScript.RegisterOnSubmitStatement(this.GetType(), "alert", sb.ToString());
}
VB.Net
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
Dim message As String = "Do you want to Submit?"
Dim sb As StringBuilder = New StringBuilder()
sb.Append("return confirm('")
sb.Append(message)
sb.Append("');")
ClientScript.RegisterOnSubmitStatement(Me.GetType(), "alert", sb.ToString())
End Sub
Screenshot
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