Calling C# function from JavaScript

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C#

ASP.NET

Javascript

Dear Friend,

I have create a web-page to display data.
I have used Tab Container in it.
Also I need to call C# function from JavaScript.
But Its not working. Kindly guide me on the same.

Code Below:
JavaScript:

function Validate()
{
//Some Code
__doPostBack('TabContainer1_TabPanel1_Button1', "OnClick");
}

C# Code:

protected void Button1_Click(object sender, EventArgs e)
    {
//Some Code
}