try this code
SqlConnection myConnection;
string str_Account_Select = "SELECT * FROM AccountsTable where coumnname="+value+"";
SqlCommand myCommand;
DataSet myDataSet;
myConnection = new SqlConnection(connectionString);
myConnection.Open();
myCommand = new SqlCommand(str_Account_Select, myConnection);
SqlDataAdapter mySQLDataAdapter;
myDataSet = new DataSet();
mySQLDataAdapter = new SqlDataAdapter(myCommand);
mySQLDataAdapter.Fill(myDataSet, "AccountsTable");
GridView1.DataSource = myDataSet;
GridView1.DataBind();
}