Slove the An unhandled exception of type 'System.OutOfMemoryException' occurred in WindowsFormsApplication1.exe in c#

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C#

my code like as:

private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.CheckFileExists = true;
            openFileDialog.AddExtension = true;
            openFileDialog.Filter = "PDF files (*.pdf)|*.pdf";
            DialogResult result = openFileDialog.ShowDialog();
            if (result == DialogResult.OK)
            {
                filename = Path.GetFileName(openFileDialog.FileName);
                path = Path.GetDirectoryName(openFileDialog.FileName);
                textBox1.Text = path + "\\" + filename;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {

            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.CheckFileExists = true;
            openFileDialog.AddExtension = true;
            openFileDialog.Filter = "PDF files (*.pdf)|*.pdf";
            DialogResult result = openFileDialog.ShowDialog();
            if (result == DialogResult.OK)
            {
                filename = Path.GetFileName(openFileDialog.FileName);
                path = Path.GetDirectoryName(openFileDialog.FileName);
                textBox2.Text = path + "\\" + filename;
            }
        }
       private void button3_Click(object sender, EventArgs e)
        {
            string s = ExtractTextFromPdf(textBox1.Text);
            string s1 = Extract(textBox2.Text);
             d = CalculateSimilarity(s, s1);
             d = Math.Round(d, 0);
            label1.Visible = true;
            label1.Text = Convert.ToString(d);
        }


     
        double CalculateSimilarity(string source, string target)
        {
            if ((source == null) || (target == null)) return 0.0;
            if ((source.Length == 0) || (target.Length == 0)) return 0.0;
            if (source == target) return 1.0;

            int stepsToSame = ComputeLevenshteinDistance(source, target);
            double ds =(1.0 - ((double)stepsToSame / (double)Math.Max(source.Length, target.Length)))*100;
            return ds;
        }


         int ComputeLevenshteinDistance(string source, string target)
        {
            if ((source == null) || (target == null)) return 0;
            if ((source.Length == 0) || (target.Length == 0)) return 0;
            if (source == target) return source.Length;

            int sourceWordCount = source.Length;
            int targetWordCount = target.Length;

            // Step 1
            if (sourceWordCount == 0)
                return targetWordCount;

            if (targetWordCount == 0)
                return sourceWordCount;

        
            int[,] distance = new int[sourceWordCount + 1, targetWordCount + 1];

            // Step 2
            for (int i = 0; i <= sourceWordCount; distance[i, 0] = i++) ;
            for (int j = 0; j <= targetWordCount; distance[0, j] = j++) ;

            for (int i = 1; i <= sourceWordCount; i++)
            {
                for (int j = 1; j <= targetWordCount; j++)
                {
                    // Step 3
                    int cost = (target[j - 1] == source[i - 1]) ? 0 : 1;

                    // Step 4
                    distance[i, j] = Math.Min(Math.Min(distance[i - 1, j] + 1, distance[i, j - 1] + 1), distance[i - 1, j - 1] + cost);
                }
            }

            return distance[sourceWordCount, targetWordCount];
        }

My application theme is geting percentage whenever compare pdf files. thats why i

have read the content of pdf files and stored in strings after that i want to compare

the two strings using LevenshteinDistance alogrithem.at the time i have error occured

in method -ComputeLevenshteinDistance.

error statment like as:

int[,] distance = new int[sourceWordCount + 1, targetWordCount + 1];

Finally error is
An unhandled exception of type 'System.OutOfMemoryException' occurred in WindowsFormsApplication1.exe.

please help me.thank u