I'm Having a problem in it, don't what what it is : m having a syntax error
OleDbCommand com = new OleDbCommand("update cus SET cus_name = ('" + textBox4.Text + "'),order=('"+textBox6.Text+"') WHERE no = ("+textBox5.Text+")", con);
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And try to use Parameters, so you dont assign values directly into the query, but in query you only write parameters, which you then add bellow.
OleDbCommand com = new OleDbCommand(@"UPDATE cus SET cus_name = @param1, order = @param2 WHERE no = @param3", con); com.Parameters.Add("@param1", OleDbType.VarChar, …
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