Merge pull request OpenGenus#2328 from loretogutierrezjr/patch-2

TryCatch.md

Author: AdiChat

guides/coding_style/c#/tryCatch.md

@@ -0,0 +1,62 @@
+---
+Title: Try Catch Statement
+---
+
+## Try Catch in CSharp
+In the world of programming most of the time for the newbie, they only code in a linear way, assuming that it will be a good practice
+and most of the time learning to error exception handling is left behind. 
+
+But it's only just a normal for newbie programmers as I came from the same shoes.:)
+
+Since I start developing I always thinking in linear way of coding until such time that my code is mixing up together.
+
+I really came accross to hardly maintain especially I don't have any error handlers before but now I always implement it in my bunch of
+code as necessary.
+
+In C# the try-catch statement consists of a try block followed by one or more catch clauses, which specify handlers for different 
+exceptions. When an exception is thrown, the common language runtime (CLR) looks for the catch statement that handles this exception. 
+If the currently executing method does not contain such a catch block, the CLR looks at the method that called the current method, 
+and so on up the call stack. If no catch block is found, then the CLR displays an unhandled exception message to the user and stops 
+execution of the program.
+
+You can read more from here in [MSDN](https://msdn.microsoft.com/en-us/library/0yd65esw(v=vs.90).aspx).
+
+Going back! 
+
+Here is my example of coding in C# for exception handling.
+
+```
+protected void btnSave_Click(object sender, EventArgs e)
+    {
+        var insCmd = new MySqlCommand("INSERT INTO user VALUES (@Id, @firstNm, @lastNm, @Role)", con);
+
+        insCmd.Parameters.AddWithValue("@Id", txtId.Text);
+        insCmd.Parameters.AddWithValue("@firstNm", txtFirstNm.Text);
+        insCmd.Parameters.AddWithValue("@lastNm", txtLastNm.Text);
+        insCmd.Parameters.AddWithValue("@Role", ddlRole.SelectedItem);
+
+        try
+        {
+            con.Open();
+            insCmd.ExecuteNonQuery();
+            lblMessage.Visible = true;
+            lblMessage.Text = "Successfully Saved!";
+            
+        }
+        catch (Exception ex)
+        {
+            lblMessage.Visible = true;
+            lblMessage.Text = "Error: " + ex.Message;
+
+        }
+        con.Close();
+        txtFirstNm.Text = "";
+        txtLastNm.Text = "";
+    }
+```
+The above code is came from one of my web based project where try catch is execute a message error if there will be an invalid character
+to insert in the database.
+
+Through this strategy it will avoid your program or web application to crushed in an unexpected situation.
+
+Hope it helps!