How to capture Gridview as Image.(Not total page)

Hello all,

I have requirement of converting Gridview into Image. Later i have to export this Gridview into MS Word, PowerPoint and PDF.

For converting gridview as Image i tried in following way.

My Code: 

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btn_GenerateImage_Click(object sender, EventArgs e)

{ 

//Bind Gridview

gview1.DataSource = MySqlDataSource;

gview1.DataBind();

 
//Getting Html of Gridview
Response.Clear();
System.Text.StringBuilder stringBuilder = new System.Text.StringBuilder();
System.IO.String ...