Display Search Results in DataGrid

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hyy all
I m new to C#, so please ignore if I use wrong terms.
I m working on a single form application in VS2010, with sql database. I have successfully inserted the data in to database table.

but search is the problem, when ever i try to perform the search the datagridview control displays all the data present in the database.

this is what I m doing...

private void btnSearchName_Click(object sender, EventArgs e)
        {
            try
            {
                sqlcon.Open();
                sqlcmd = new SqlCommand("select * from tblContacts where NAME = ('"+ txtSearchName.Text +"')") ;
                sqlcon.Close();
 

but this query returns all the data present in the database, please see attachment.

thanks