How to convert Gridview to datatable in asp.net c#?

Question

i have upload one excel file and convert into datatable and bind the datatable in gridview.

i have one button click to add new row in grid view. i want get old data into datatable and adding new row how to do it.

 

i have used below codes to get grid view to data table but this is not working.that codes add only new row old rows are remove or hided.

 

 sample1

 

DataTable gridTable = (DataTable) dataGrid1.DataSource; 

 

sample 2

 

BindingSource bs = (BindingSource)dgrid.DataSource; // Se convierte el DataSource 
 DataTable tCxC = (DataTable) bs.DataSource;

sample 3

DataTable dt = new DataTable();
 for (int i = 0; i < GridView1.Columns.Count; i++)
 {       
  dt.Columns.Add("column"+i.ToString()); 
} 
foreach (GridViewRow row in GridView1.Rows)
 {
 DataRow dr = dt.NewRow();
 for(int j = 0;j<GridView1.Columns.Count;j++)
 {                 
dr["column" + j.ToString()] = row.Cells[j].Text;
 }              dt.Rows.Add(dr);
 }

C#

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Answer 1

Hi you can try this code
private void Form1_Load(object sender, EventArgs e)
{
OleDbConnection connect = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=C:\Users\Anas\Dropbox\C# Projects\2.Database\ClOsODb.accdb; Persist Security Info=False");
connect.Open();
string cmd = "select * from Course Number and Name";
OleDbDataAdapter adapter = new OleDbDataAdapter(new OleDbCommand(strSql, connect));
 DataSet ds = new DataSet();
adapter.Fill(ds);

course_Number_and_NameComboBox.DataSource = ds.Tables[0];
course_Number_and_NameComboBox.DisplayMember = "Course Number and Name";
course_Number_and_NameComboBox.ValueMember = "ID";
connect.Close();
}

Answer 2

But I am using C#, not VB. Sorry I did not mention it in the question.

Answer 3

Hi you can try below code

Dim cn As New OleDbConnection("provider=Provider=Microsoft.ACE.OLEDB.12.0;data source=C:\Users\Anas\Dropbox\C# Projects\2.Database\ClOsODb.accdb")

   Dim da As New OleDbDataAdapter()

   Dim dt As New DataTable()

   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

      cn.Open()

      da.SelectCommand = New OleDbCommand("select * from [course Number and Name]", cn)

      da.Fill(dt)

 

      ComboBox1.DataSource = dt

      ComboBox1.DisplayMember = "Course Number and Name";

      ComboBox1.ValueMember = "ID";

 

      ' or this way

      ComboBox1.Items.Clear()

      Dim r As DataRow

      For Each r In dt.Rows

         ComboBox1.Items.Add(r(1).ToString)

      Next

      cn.Close()

   End Sub