Export Datagridview to Excel in VS 2012

DataSet ds=new DataSet();
ds=LoadData(qry);

            // creating Excel Application
            Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel.Application();


            // creating new WorkBook within Excel application
            Microsoft.Office.Interop.Excel._Workbook workbook = app.Workbooks.Add(Type.Missing);


            // creating new Excelsheet in workbook
            Microsoft.Office.Interop.Excel._Worksheet worksheet = null;

            // see the excel sheet behind the program
            app.Visible = true;

            // get the reference of first sheet. By default its name is Sheet1.
            // store its reference to worksheet
            worksheet = workbook.Sheets["Sheet1"];
            worksheet = workbook.ActiveSheet;

            // changing the name of active sheet
            worksheet.Name = "Students List";


            // storing header part in Excel
            for (int i = 1; i < ds.Tables[0].Columns.Count + 1; i++)
            {
                worksheet.Cells[1, i] = ds.Tables[0].Columns[i - 1].ColumnName.ToString();
            }



            // storing Each row and column value to excel sheet
            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
            {
                for (int j = 0; j < ds.Tables[0].Columns.Count; j++)
                {
                    worksheet.Cells[i + 2, j + 1] = ds.Tables[0].Rows[i][j].ToString();
                }
            }


            // save the application
            workbook.SaveAs("d:\\output.xls");

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Befor that add Microsoft.Office.Interop.Excel dll in reference

if (dataGridView1.Rows.Count > 0)
            {
                Microsoft.Office.Interop.Excel.ApplicationClass XcelApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
                XcelApp.Application.Workbooks.Add(Type.Missing);

                for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
                {
                    XcelApp.Cells[1, i] = dataGridView1.Columns[i - 1].HeaderText;
                }
                for (int i = 0; i < dataGridView1.Rows.Count; i++)
                {
                    for (int j = 0; j < dataGridView1.Columns.Count; j++)
                    {
                        XcelApp.Cells[i + 2, j + 1] = dataGridView1.Rows[i].Cells[j].Value.ToString();
                    }
                }

                XcelApp.Columns.AutoFit();
                XcelApp.Visible = true;

            }
            else
            {
                MessageBox.Show("No Data to Export");
            }
          

VS 2008 Exporting Datagrid to Excel

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Change Control Focus on Enter Key Press in C#
(write the code in form keydown event,{enable keypreview=true;})

 if (e.KeyCode == Keys.Enter) { SendKeys.Send("{TAB}");}

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1. PRIME NUMBER - Defnition
2. A prime number is a whole number greater than 1, whose only two whole-number factors are 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.

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Source Code to Display Prime Numbers Between two Intervals

/* C program to display all prime numbers between Two interval entered by user. */
#include <stdio.h>
int main()
{
  int n1, n2, i, j, flag;
  printf("Enter two numbers(intevals): ");
  scanf("%d %d", &n1, &n2);
  printf("Prime numbers between %d and %d are: ", n1, n2);
  for(i=n1+1; i<n2; ++i)
  {
      flag=0;
      for(j=2; j<=i/2; ++j)
      {
        if(i%j==0)
        {
          flag=1;
          break;
        }
      }
      if(flag==0)
        printf("%d ",i);
  }
  return 0;
}

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C Program to Add Two Matrix

#include <stdio.h>
 
int main()
{
   int m, n, c, d, first[10][10], second[10][10], sum[10][10];
 
   printf("Enter the number of rows and columns of matrix\n");
   scanf("%d%d", &m, &n);
   printf("Enter the elements of first matrix\n");
 
   for (c = 0; c < m; c++)
      for (d = 0; d < n; d++)
         scanf("%d", &first[c][d]);
 
   printf("Enter the elements of second matrix\n");
 
   for (c = 0; c < m; c++)
      for (d = 0 ; d < n; d++)
            scanf("%d", &second[c][d]);
 
   printf("Sum of entered matrices:-\n");
 
   for (c = 0; c < m; c++) {
      for (d = 0 ; d < n; d++) {
         sum[c][d] = first[c][d] + second[c][d];
         printf("%d\t", sum[c][d]);
      }
      printf("\n");
   }
 
   return 0;
}

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