Javascript function doesn't called from codebehind

Question

I have function in javascript with argument and I want to call this function multiple times when Gridview bind its data. so I have put the code like this

if (e.Row.RowType == DataControlRowType.DataRow)
{
    if (((DataRowView)e.Row.DataItem) != null)
 {
Page.ClientScript.RegisterStartupScript(this.GetType(),new Random().Next(100).ToString(), 
                        "likeStatus('"+argument+"')", true);
 }
}

Each time I change the value of key but this function is called only once. so please help me what should I do to call function in each iteration of gridview binding.

Thanks in advance

make the key dynamic, so that each script in page is registered with a unique id, it shall then be called. Registering with the same key prohibits multiple script registrations. — Furqan Hameedi
– Furqan Hameedi, Commented Nov 10, 2012 at 10:18
Mr.Vishal have u not seen I have already told that I am using random key — Brijesh Gandhi
– Brijesh Gandhi, Commented Nov 10, 2012 at 10:36

Magnus · Accepted Answer · 2012-11-10 12:14:13Z

The problem is that if you need randomness you need to use the same instance of Random and can't create a new one each time. The way you are doing it right now might generate the same value every time. (Also note that a random value is not the same as a unique value)
To solve the problem I would however do thing a little differently.

Declare a StringBuilder as a field in you class. Create it before you bind the grid:

sb = new StringBuilder();
gridView.DataBind();

Then in the RowDataBound event of the GridView write to the builder.

if (e.Row.RowType == DataControlRowType.DataRow)
{
    if (((DataRowView)e.Row.DataItem) != null)
       sb.Append("likeStatus('"+argument+"');");
}

Finally in PreRender register the script string

Page.ClientScript.RegisterStartupScript(this.GetType(), "MyScript", 
                        sb.ToString(), true);

Alternatively use a unique value as the key, for example Guid.NewGuid().ToString()

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