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    <p><strong>First Method: (Tested)</strong></p> <p>Code in .aspx.cs:</p> <pre><code> protected void Page_Load(object sender, EventArgs e) { ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged); if (!Page.IsPostBack) { ddl.Attributes.Add("onchange", "CalcTotalAmt();"); } } protected void ddl_SelectedIndexChanged(object sender, EventArgs e) { //Your Code } </code></pre> <p>JavaScript function: return true from your JS function</p> <pre><code> function CalcTotalAmt() { //Your Code } </code></pre> <p>.aspx code:</p> <pre><code>&lt;asp:DropDownList ID="ddl" runat="server" AutoPostBack="true"&gt; &lt;asp:ListItem Text="a" Value="a"&gt;&lt;/asp:ListItem&gt; &lt;asp:ListItem Text="b" Value="b"&gt;&lt;/asp:ListItem&gt; &lt;/asp:DropDownList&gt; </code></pre> <p><strong>Second Method: (Tested)</strong></p> <p>Code in .aspx.cs:</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { if (Request.Params["__EVENTARGUMENT"] != null &amp;&amp; Request.Params["__EVENTARGUMENT"].Equals("ddlchange")) ddl_SelectedIndexChanged(sender, e); if (!Page.IsPostBack) { ddl.Attributes.Add("onchange", "CalcTotalAmt();"); } } protected void ddl_SelectedIndexChanged(object sender, EventArgs e) { //Your Code } </code></pre> <p>JavaScript function: return true from your JS function</p> <pre><code>function CalcTotalAmt() { //Your Code __doPostBack("ctl00$MainContent$ddl","ddlchange"); } </code></pre> <p>.aspx code:</p> <pre><code>&lt;asp:DropDownList ID="ddl" runat="server" AutoPostBack="true"&gt; &lt;asp:ListItem Text="a" Value="a"&gt;&lt;/asp:ListItem&gt; &lt;asp:ListItem Text="b" Value="b"&gt;&lt;/asp:ListItem&gt; &lt;/asp:DropDownList&gt; </code></pre>
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    1. This table or related slice is empty.
    1. POCall JavaScript function on DropDownList SelectedIndexChanged Event:
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    1. USKapil Khandelwal
    1. USKapil Khandelwal
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POCall JavaScript function on DropDownList SelectedIndexChanged Event:
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    1. This table or related slice is empty.
    1. VO
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      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. This table or related slice is empty.
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    3. VO
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    1. COthe Javascript function is executing.. But i have written some coding in selectedindexchanged event. But that event is not firing.. how to solve this problem?
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      1. USthevan
    2. CO@thevan see my updated answer.
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    3. COBut still its not firing.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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