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GUI Button display totals C#

I am very new to coding, so this is likely a simple answer. I am trying to get my GUI button in C# to display the total of an arithmetic function I wrote. For example:
int totalGold = goldOnHand + earnedGold;
I have tried to display the totalGold as such in a text box name TxtGold:
private void BtnSplit_Click(object sender, EventArgs e) {
TxtGold.Text = "totalGold";
}
The text box only displays: totalGold
How do I get the textbox to display the integer that represents the total amount of gold instead of the phrase totalGold?
Thanks for any help from someone willing to give a hand to a noob!

In this code
int totalGold = goldOnHand + earnedGold;
You created a variable called totalGold. And you want to display it in a text box. That's so far so good. But when you try to set the text, things went wrong. You set the text of the text box to "totalGold".
In C#, "" means a string literal. Its value is "What you see is what you get". So when you say "totalGold", it displays the word totalGold. What you need to do is to remove the "" so that totalGold turns into a variable.
TxtGold.Text = totalGold;
But totalGold is an integer! you can only set the text of a text box using a string! How to convert from an integer to a string? Simple, use the ToString() method!
TxtGold.Text = totalGold.ToString();

Turn it into a string using the ToString() method:
TxtGold.Text = totalGold.ToString();
WHY:
What you were doing is setting the text of the button to a string literal, not the value of the variable.
Additionally, you cannot set TxtGold.Text to the integer, because it is a string property (see MSDN). Therefore, you have to do a ToString() to convert the integer to a string.

TxtGold.Text = "totalGold"; will print the string "totalGold" in your text box. If you need to print the integer value assigned to variable totalGold you have to print it as shown below
TxtGold.Text = totalGold.ToString();//that is, avoid the double quotes
the full code might be as follows
private void BtnSplit_Click(object sender, EventArgs e) {
int totalGold = goldOnHand + earnedGold;
TxtGold.Text = totalGold.ToString();
}

System.FormatException is unhandled by user code

I am sending my poolid in hdnfield when am converting it to show me error . poolid is int32 datatype
if (ddlStaticPoolName.Visible)
{
objUserEntity.POOLNAME = Convert.ToString(ddlStaticPoolName.SelectedItem.Text);
objUserEntity.POOlID = Convert.ToInt32(ddlStaticPoolName.SelectedValue);
}
else if (lblDynamicPoolName.Visible)
{
objUserEntity.POOLNAME = Convert.ToString(lblDynamicPoolName.Text);
objUserEntity.POOlID =Convert.ToInt32(hdnDynamicPoolID.Value);
}
else
{
objUserEntity.POOLNAME = "";
objUserEntity.POOlID = 0;
}

If the string Contains numerical characters But its not Whole Number (ex: double , decimal).
objUserEntity.POOlID = Convert.ToInt32(Convert.ToDouble(ddlStaticPoolName.SelectedValue));
If the string contains double Number it Cant be directly converted to Int. If this not Solve your problem you must give an Example of ddlStaticPoolName.SelectedValue.
If the string Contains Non numerical characters. Then you should use TryParse.
int num;
Int32.TryParse(ddlStaticPoolName.SelectedValue, out num);
objUserEntity.POOlID = num;
If the string contains invalid number. TryParse will set the value of num to 0. otherwise to the value Converted from string.
If you try this solutions one of them must solve your problem. But Try First solution then go To the next solution.

C# - Input string was not in a correct format

I am working on a simple windows forms application that the user enters a string with delimiters and I parse the string and only get the variables out of the string.
So for example if the user enters:
2X + 5Y + z^3
I extract the values 2,5 and 3 from the "equation" and simply add them together.
This is how I get the integer values from a string.
int thirdValue
string temp;
temp = Regex.Match(variables[3], #"\d+").Value
thirdValue = int.Parse(temp);
variables is just an array of strings I use to store strings after parsing.
However, I get the following error when I run the application:
Input string was not in a correct format

Why i everyone moaning about this question and marking it down? it's incredibly easy to explain what is happening and the questioner was right to say it as he did. There is nothing wrong whatsoever.
Regex.Match(variables[3], #"\d+").Value
throws a Input string was not in a correct format.. FormatException if the string (here it's variables[3]) doesn't contain any numbers. It also does it if it can't access variables[3] within the memory stack of an Array when running as a service. I SUSPECT THIS IS A BUG The error is that the .Value is empty and the .Match failed.
Now quite honestly this is a feature masquerading as a bug if you ask me, but it's meant to be a design feature. The right way (IMHO) to have done this method would be to return a blank string. But they don't they throw a FormatException. Go figure. It is for this reason you were advised by astef to not even bother with Regex because it throws exceptions and is confusing. But he got marked down too!
The way round it is to use this simple additional method they also made
if (Regex.IsMatch(variables[3], #"\d+")){
temp = Regex.Match(variables[3], #"\d+").Value
}
If this still doesn't work for you you cannot use Regex for this. I have seen in a c# service that this doesn't work and throws incorrect errors. So I had to stop using Regex

I prefer simple and lightweight solutions without Regex:
static class Program
{
static void Main()
{
Console.WriteLine("2X + 65Y + z^3".GetNumbersFromString().Sum());
Console.ReadLine();
}
static IEnumerable<int> GetNumbersFromString(this string input)
{
StringBuilder number = new StringBuilder();
foreach (char ch in input)
{
if (char.IsDigit(ch))
number.Append(ch);
else if (number.Length > 0)
{
yield return int.Parse(number.ToString());
number.Clear();
}
}
yield return int.Parse(number.ToString());
}
}

you can change the string to char array and check if its a digit and count them up.
string temp = textBox1.Text;
char[] arra = temp.ToCharArray();
int total = 0;
foreach (char t in arra)
{
if (char.IsDigit(t))
{
total += int.Parse(t + "");
}
}
textBox1.Text = total.ToString();

This should solve your problem:
string temp;
temp = Regex.Matches(textBox1.Text, #"\d+", RegexOptions.IgnoreCase)[2].Value;
int thirdValue = int.Parse(temp);

hex to bin converter

I have a textbox which takes as input hex values and a messagebox which shows the output in binary. For example:
input : F710(string)
output : 1111011100010000
I will use that value in another work. How could I do this?

I am not really sure if I understand your question, but the easiest thing that comes to mind is to just calculate the values on the fly. For example:
public static string BitStringFromHexString(string hex)
{
int i;
if (!Int32.TryParse(hex, System.Globalization.NumberStyles.HexNumber, null, out i))
{
throw new ArgumentException(String.Format("Input not recognized '{0}'. ", hex), "hex");
}
return Convert.ToString(i,2);
}

string binV = "";
binV = Convert.ToString(Convert.ToInt32(textBox1.Text, 16), 2);
textBox2.Text=binV;
Should do the job for ya.

Converting Dropdown list to int

hello mates i am trying to store value from dropdown list to an integer but i am getting an exception Input string was not in a correct format.
int experienceYears = Convert.ToInt32("DropDownList1.SelectedValue");
please help.

Remove the quotes; the code as it stands is trying to convert the literal string "DropDownList1.SelectedValue" to an integer, which it can't.
int experienceYears = Convert.ToInt32(DropDownList1.SelectedValue);

Try it without the quotes:
int experienceYears = Convert.ToInt32(DropDownList1.SelectedValue);