C#

private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length > 0)
            {
                textBox2.Text = Convert.ToInt32(textBox1.Text, 2).ToString();
            }
            else
            {
                MessageBox.Show("Deger girilecek alan boş.", "HATA!!!", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

void Button1Click(object sender, EventArgs e)
{
    // TODO: Implement Button1Click
 
    if (textBox1.Text.Length > 0)
    {
	try 
	{
	  textBox2.Text = Convert.ToInt32(textBox1.Text, 2).ToString();
	} 
	catch (Exception) 
	{
	  MessageBox.Show("You didn't entered a Binary number !",
		          "Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
	}
                
     }
     else
     {
        MessageBox.Show("You didn't entered a Binary number !",
		         "Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
     }
}

/*
 * Created by SharpDevelop.
 * User: Peric Zeljko
 * Date: 7.10.2011
 * Time: 8:51
 *
 *  
 * Simple console program for conversion of
 *      Binary numbers to Real numbers
 * 
 */
using System;


namespace Binary_to_Decimal
{
	class Program
	{
		public static void Main(string[] args)
		{
			//
			// declaration of variables
			//
			string [] DecimalFloat = new string[2];
			string Binary = "";
			bool RealRelevance = false;
			bool BinaryRelevance = false;
			int Index = 0;
			int Lenght = 0;
			int Exponent = 0;
			int Cipher = 0;
			double BaseExponent = 0;
			double RealNumber = 0;
			double D = 0;
			double F = 0;
			string Negative = "";
			string DecimalPart = "";
			string FloatPart = "";
			string Letter = "";
			
			// 
			// not very desirable but necessary
			// begining of program label
			//
	begining :
				
			//
			// Hello message to user
			//
			Console.Title = "Program Binary to Real ";
			Console.SetWindowSize(80,40);
			Console.ForegroundColor = ConsoleColor.Green;
			Console.Clear();
			Console.WriteLine("****************************************************************************");
			Console.WriteLine("                          Binary to Real");
			Console.WriteLine("****************************************************************************");
			
			
			// 
			// Get number from Console
			//
			Console.WriteLine();
		      Console.Write("Enter binary number (exmpl: 1001) : ");
		      Binary = "";
			Binary = Console.ReadLine();
			Console.WriteLine();
			Console.WriteLine("****************************************************************************");

			
			// 
			// Check if it is Real number
			// 
			RealRelevance = false;
			RealNumber = 0;
			RealRelevance = double.TryParse(Binary,out RealNumber);
			if (RealRelevance == true)
			{
				//
				// clear sign plus or minus
				//
				if (Binary.Contains("-"))
				{
					Binary = Binary.TrimStart('-');
					Negative = "- ";
					RealNumber = -1 * RealNumber;
				}
				else if (!Binary.Contains("-") && !Binary.Contains("+"))
				{
					Negative = "";
				}
				else  if (Binary.Contains("+"))
				{
					Binary = Binary.TrimStart('+');
					Negative = "+ ";
					RealNumber = double.Parse(Binary.ToString());
				}
				
				//
				// Clears number if it is number with float point
				// with all possibilites
				//
				// exmpl. 0001101,01010000 = 1101,0101
				//
				if ( Binary.Contains(","))
				{
					DecimalFloat = Binary.Split(',');
					DecimalPart = DecimalFloat[0];
					FloatPart = DecimalFloat[1];
					
					DecimalPart = DecimalPart.TrimStart('0');
					if (DecimalPart =="")
					{
						DecimalPart = "0";
					}
					
					FloatPart = FloatPart.TrimEnd('0');
					if (FloatPart =="")
					{
						FloatPart = "0";
					}
					
					if (DecimalPart =="0" && FloatPart =="0")
					{
						Binary = "0";
					}
					if (DecimalPart !="0" && FloatPart =="0")
					{
						Binary = DecimalPart;
					}
					if (DecimalPart =="0" && FloatPart !="0")
					{
						Binary = DecimalPart + "," + FloatPart;
					}
					if (DecimalPart !="0" && FloatPart !="0")
					{
						Binary = DecimalPart + "," + FloatPart;
					}
				}
				
				//
				// if it is decimal number
				//
				else
				{
					Binary = Binary.TrimStart('0');
					if (Binary =="")
					{
						Binary = "0";
					}
				}
			}
			
			else if (RealRelevance == false)
			{
				Console.WriteLine("Error , you didn't entered a number at all..");
				Console.WriteLine();
				
				//
				// goto jump is not very desirable but necessary
				//
				goto end;
			}
			
			//
			// Check Binary number relevance
			//
			Index = 0;
			Lenght = 0;
			Letter = "";
			Lenght = Binary.Length;
			for (Index=0;Index<Lenght ;Index = Index + 1) 
			{
				Letter = Binary.Substring(Index,1);
				if (Letter != "0" && Letter != "1" && Letter !=",") 
				{
					BinaryRelevance = false;
					Index = Lenght;
				}
				else
				{
					BinaryRelevance = true;
				}
			}
			
			if (BinaryRelevance != true)
			{   
				Console.WriteLine();
				Console.WriteLine("Error , you didn't enter binary number ...");
				Console.WriteLine();
				
				//
				// goto jump is not very desirable but necessary
				//
				goto end;
			}
			
			//
			// Resolving conversion from Binary to Decimal
			// If it is Float number, split number to Decimal and Float part
			// exmpl. 11.011(2) DecimalPart = 11 and FloatPart = 011
			//
			if (Binary.Contains(","))
			{
				DecimalFloat = Binary.Split(',');
				DecimalPart = DecimalFloat[0];
				FloatPart = DecimalFloat[1];
				
				//	
				// Decimal part first
				//
				Exponent = 0;
				BaseExponent = 0;
				Cipher = 0;
				D = 0;
				Index = 0;
				Lenght = 0;
				Letter = "";
				Lenght = DecimalPart.Length;
				for(Index=0;Index<Lenght ;Index=Index+1) 
				{
					Exponent = Lenght - Index - 1;
					Letter = DecimalPart.Substring(Index,1);	
					Cipher = int.Parse(Letter.ToString());
					BaseExponent =  double.Parse(Math.Pow(2,Exponent).ToString());
					D = D + (Cipher * BaseExponent);
				}
				
				//
				// Float part second
				//
				Exponent = 0;
				BaseExponent = 0;
				Cipher = 0;
				F = 0;
				Index = 0;
				Lenght = 0;
				Letter = "";
				Lenght = FloatPart.Length;
				for(Index=0;Index<Lenght ;Index=Index+1) 
				{
					Exponent = Index+1;
					Letter = FloatPart.Substring(Index,1);
					BaseExponent =  double.Parse(Math.Pow(2,-Exponent).ToString());
					Cipher = int.Parse(Letter.ToString());
					F = F + (Cipher * BaseExponent);
				}
				RealNumber = D + F;

				//
				// goto jump is not very desirable but necessary
				// 
				//
				goto write;
			}
			
			//
			// Resolving conversion from Binary to Decimal
			// If it is Decimal number
			// exmpl. 1001
			//

			else 
			{
				Exponent = 0;
				Cipher = 0;
				RealNumber = 0;
				Index = 0;
				Lenght = 0;
				Letter = "";
				Lenght = Binary.Length;
				for(Index=0;Index<Lenght ;Index=Index+1) 
				{
					Exponent = Lenght - Index - 1;
					Letter = Binary.Substring(Index,1);				
					BaseExponent =  double.Parse(Math.Pow(2,Exponent).ToString());
					Cipher = int.Parse(Letter.ToString());
					RealNumber = RealNumber + (Cipher * BaseExponent);
				}
			}
			
			// 
			// not very desirable but necessary
			// write label
			//
	write:
			//
			// Write result
			//
			if (RealNumber == 0)
			{
				Negative ="";
			}
			Console.WriteLine();
			Console.WriteLine("Binary number :  " + Negative + Binary);
			Console.WriteLine();
			Console.WriteLine("Real number   :  " + Negative + RealNumber.ToString());
			Console.WriteLine();
			
			// 
			// not very desirable but necessary
			// end of program label
			//
	end:
			Console.WriteLine("****************************************************************************");
			Console.WriteLine();
			Console.Write("Do you want to run program again y / n : ");
			Letter = Console.ReadLine();
			if ( Letter == "Y" || Letter == "y")
			{
				goto begining;
			}
		}
	}
}

private void textBox1_TextChanged(object sender, EventArgs e)
{
    bool isvalid = true;
    string txt1="", txt2 = "HATA!!!";
    string sayii = textBox1.Text;
    int strt = 0;
    int bitOffset = 1;
    byte x;
    if (sayii.Length == 0)
    {
        txt1 = "Deger girilecek alan boş.";
        isvalid = false;
    }
    else if (sayii.Length > 32)
    {
        txt1 = "A binary integer can only be 32 bits long";
        txt2 = "HATA!!!";
        isvalid = false;
        MessageBox.Show(txt1, txt2, MessageBoxButtons.OK, MessageBoxIcon.Error);
        textBox1.Text = sayii.Substring(0, 32);
        return;// previous command spawns a text changed event
    }
    else if (sayii.Length == 32)
    {
        x = (byte)sayii[0];
        if (x < 48 || x > 49)
        {
            txt1 = "A binary value must be 1 or 0";
            txt2 = "HATA!!!";
            isvalid = false;
            MessageBox.Show(txt1, txt2, MessageBoxButtons.OK, MessageBoxIcon.Error);
            textBox1.Text = sayii.Substring(1, 31);
            return;// previous command spawns a text changed event
        }
        if (x == 49) strt = int.MinValue;
        sayii = sayii.Substring(1, 31);
    }
    for (int i = sayii.Length; i > 0 && isvalid; )
    {
        x = (byte)sayii[--i];
        if (x == 49)
            strt += bitOffset;
        else if (x != 48)
        {
            txt1 = "A binary value must be 1 or 0";
            isvalid = false;
        }
        bitOffset *= 2;
    }

    if (!isvalid)
    {
        MessageBox.Show(txt1, txt2, MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
    else textBox2.Text = "  " + strt.ToString();
}

Peter_in_2780 wrote:

Also, have a look at this thread[^].

Stan Moong wrote:

Are there any good reporting and database tools that you would recommend for C#?

Bastard Programmer from Hell

using Microsoft.VisualBasic.Devices;
...
    Computer c = new Computer();
    Debug.WriteLine("O/S: " + c.Name);

Paramu1973 wrote:

remote application

Paramu1973 wrote:

my application is slow at data loading and saving