How to handle SQL Query CommandTimeout in C# 2.0 - c#-2.0

I have got below code in c#.
SqlConnection conn = new SqlConnection("Data Source=MANOJ-PC\\SQLEXPRESS;Initial Catalog=master;Integrated Security=False;User Id=sa;Password=Manoj;");
conn.Open();
if (conn != null)
{
//create command
SqlCommand cmd = new SqlCommand("dbo.GETTridionLinkData", conn);
cmd.Parameters.AddWithValue("#PageID", "637518");
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandTimeout = 500;
StringBuilder sbXML = new StringBuilder();
//Adding Root node
sbXML.Append("<TridionLinks>");
//Reading all the values of Stored procedure return
using (XmlReader reader = cmd.ExecuteXmlReader())
{
while (reader.Read())
{
sbXML.Append(reader.ReadOuterXml().Replace("//", "/"));
}
}
//Closing the root node tag
sbXML.Append("</TridionLinks>");
XmlDocument xDoc = new XmlDocument();
//Loading string xml in XML Document
xDoc.LoadXml(sbXML.ToString());
}
In above code you can see that, I have set the cmd.CommandTimeout = 500;, now I want to give user an error message if the timeout is more than this or you can say database is down.
Please suggest!!

Please refer to
How to catch SQLServer timeout exceptions
The question has already been answered..
To improve coding, you can use
try{
using (sqlconnection Conn = new SqlConnection("Data Source=MANOJ-PC\\SQLEXPRESS;Initial Catalog=master;Integrated Security=False;User Id=sa;Password=Manoj;"){
...
}
}catch(sqlException ex){
if (ex.Number == -2) {
//return your message to the control or display the error
}
}
well just an example..

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I've created a project in Visual Studio 2019 which has several user controls in a form called Home.
All goes right until today. After rebuilding my project Home form shows an error saying
The control system.windows.forms.form has thrown an unhandled exception in the designer and has been desabled.
Exception :
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I checked the connection code, and it looks ok. But still the error isn't solved.
Code:
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con.Open()
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SqlCommand cmd = new SqlCommand(str, con);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
String val = dr[0].ToString();
if (val == "")
{
.....
}
private void button1_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(#"Data Source= (LocalDB)\MSSQLLocalDB;AttachDbFilename=D:\Final Project BCA\PharmacyManagementSystemCSharp\Database\pharmacy.mdf;Integrated Security=True");
con.Open();
try
{
String str = "Insert into supp(name,email,mobile,addr,s_code) values('" + Sup_Name.Text + "','" + Sup_Email.Text + "','" + Sup_Mobile.Text + "','" + Sup_Add.Text + "','" + Sup_Code.Text + "');";
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cmd.ExecuteNonQuery();
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using (SqlConnection con1 = new SqlConnection(#"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=D:\Final Project BCA\PharmacyManagementSystemCSharp\Database\pharmacy.mdf;Integrated Security=True"))
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DataTable dt = new DataTable();
sda.Fill(dt);
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Sup_Name.Text = "";
Sup_Code.Text = "";
Sup_Email.Text = "";
Sup_Mobile.Text = "";
Sup_Add.Text = "";
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}
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if not 0
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continue your code after this...
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Look for this line:
dependencies {
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...
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