try { SqlConnection con = new SqlConnection(@ "jjj"); SqlCommand comm = new SqlCommand("select [??????_??????] from client where [??? _??????]= '" + comboBox1.SelectedValue + "' ", con); con.Open(); prevtxt.Text =(string)comm.ExecuteScalar(); con.Close(); } catch (System.Exception ex) { MessageBox.Show(ex.Message); }
var
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