[SQL] How to get the Headers/Column Name of gridview table binded with SqlDataSource

I want to extract the columns names of gridview and bind those columns names with a drop down to make a filter template. I'm facing little challenge to get the columns names from gridview on page load event. Below is the code what i am trying with error.

and "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"

Response.Write(GridView1.Rows[0].Cells[0].Text.ToString());
Response.Write(GridView1.Rows[0].Cells[1].Text.ToString());
Response.Write(GridView1.Rows[0].Cells[2].Text.ToString());
Response.Write(GridView1.Rows[0].Cells[3].Text.ToString());


Above code is not working, if it works i can add this in foreach loop for each column

Note : There is some hidden (visible=false) fields also in gridview

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