Loading controls dynamically in asp.net Part 110

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ترتيب الدرس : 110
المدة : 00:17:28
التحكم :
Text version of the video
http://csharp-video-tutorials.blogspot.com/2013/01/loading-controls-dynamically-in-aspnet.html

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Slides
http://csharp-video-tutorials.blogspot.com/2013/08/part-110-loading-aspnet-controls.html

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In this video we will discuss about
1. Adding controls dynamically
2. Tips and tricks to maintain the state of dynamically added controls across postback

To maintain the state of controls across postback
1. Add the controls in the page load event, and set their visibility to false.
2. Based on the DropDownList selection, show/hide the dynamically added controls

For the HTML and code samples used in the demo please visit my blog at the following link
http://csharp-video-tutorials.blogspot.com/2013/01/loading-controls-dynamically-in-aspnet.html

Code Behind Code
protected void Page_Load(object sender, EventArgs e)
{
TextBox TBnew TextBox();
TB.ID"TB1";
PlaceHolder1.Controls.Add(TB);
TB.Visiblefalse;

DropDownList DDLnew DropDownList();
DDL.ID"DDL1";
DDL.Items.Add("New York");
DDL.Items.Add("New Jersey");
DDL.Items.Add("Washington DC");
PlaceHolder1.Controls.Add(DDL);
DDL.Visiblefalse;

if (DropDownList1.SelectedValue"TB")
{
TB.Visibletrue;
}
else if (DropDownList1.SelectedValue"DDL")
{
DDL.Visibletrue;
}
}

protected void Button1_Click(object sender, EventArgs e)
{
if (DropDownList1.SelectedValue"TB")
{
Response.Write(((TextBox)PlaceHolder1.FindControl("TB1")).Text);
}
else if (DropDownList1.SelectedValue"DDL")
{
Response.Write(((DropDownList)PlaceHolder1.FindControl("DDL1")).SelectedItem.Text);
}
}

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Sep 23, 2020 07:32:26
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