I got the solution by storing the virual path in the database and saving the image using physical path.
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So when I need to display the Image in the Gridview, I display it using the virtual path in the database.
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Physical path :
string strPath = Server.MapPath("~/images/");
fileupload1.saveAs(strPath);
And I store in the database just :
string strVirPath = "~/images/"+fileupload1.FileName;
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Thanks All for your Answers.
Happy Coding!!!