Passing Variables in Web Forms
Summary
This video (9 minutes) demonstrates how to pass a variable from a web form to another web form. The three methods demonstrated are (1) using the Session state, (2) Using HTTP query string method, and (3) using HTTP POST method.
Video
Code
FormA.aspx
<body>
<form id=”form1″ runat=”server” method=”post”>
<div style=”font-weight: 700″>
Enter Value to Transfer<asp:TextBox ID=”tbData” runat=”server”> <asp:TextBox><br /><br />
<asp:Button ID=”btnSession” runat=”server”
Text=”Transfer Using Session Variable” onclick=”btnSession_Click” />
<asp:Button ID=”btnGet” runat=”server” Text=”HTTP Get Request”
onclick=”btnGet_Click” />
<asp:Button ID=”btnPost” runat=”server” Text=”HTTP Post Request”
PostBackUrl=”~/FormD.aspx” />
</div>
</form>
</body>
public partial class FormA : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSession_Click(object sender, EventArgs e)
{
string value = tbData.Text;
Session.Add(“val”, value);
Response.Redirect(“FormB.aspx”);
}
protected void btnGet_Click(object sender, EventArgs e)
{
Response.Redirect(“FormC.aspx?val=” + tbData.Text);
}
}
FormB .aspx
<body>
<form id=”form1″ runat=”server”>
<div>
You passed:
<asp:TextBox ID=”tbValue” runat=”server” ></asp:TextBox>
</div>
</form>
</body>
FormB.cs
public partial class FormB : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
tbValue.Text=Session[“val”].ToString();
}
}
FormC.aspx
body>
<form id=”form1″ runat=”server”>
<div>
You passed:
<asp:TextBox ID=”tbValue” runat=”server” ></asp:TextBox>
</div>
</form>
</body
FormC.cs
public partial class FormC : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
tbValue.Text = Request[“val”].ToString();
}
}
FormD.aspx
<body>
<form id=”form1″ runat=”server”>
<div>
You passed:
<asp:TextBox ID=”tbValue” runat=”server” ></asp:TextBox>
</div>
</form>
</body>
FormD.cs
public partial class FormD : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string[] s = Request.Form.GetValues(“tbData”);
tbValue.Text = s[0];
}
}
Resources
How to Pass values Between ASP.Net Web Pages – http://msdn.microsoft.com/en-us/library/6c3yckfw.aspx
HttpResponse Class – http://msdn.microsoft.com/en-us/library/system.web.httpresponse.aspx
HttpRequest Class – http://msdn.microsoft.com/en-us/library/system.web.httprequest.aspx
Http Session – http://msdn.microsoft.com/en-us/library/ms178581.aspx