Convert ASP.Net GridView to DataTable using C# and VB.Net

Dear Mohal92,

Refer below sample.

Database

I have made use of the following table Customers with the schema as follows.

I have already inserted few records in the table.

You can download the database table SQL by clicking the download link below.

Download SQL file

HTML

<asp:GridView runat="server" ID="gvCustomers" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="CustomerId" HeaderText="ID" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
        <asp:CommandField ButtonType="Button" ShowEditButton="true" HeaderText="Button" />
    </Columns>
</asp:GridView>
<br />
<asp:Button Text="Save" runat="server" OnClick="OnSave"/>

Namespaces

C#

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

VB.Net

Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        this.BindGrid();
    }
}

private void BindGrid()
{
    string conn = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(conn))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT CustomerId, Name, Country FROM Customers", con))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
            {
                using (DataTable dt = new DataTable())
                {
                    sda.Fill(dt);
                    gvCustomers.DataSource = dt;
                    gvCustomers.DataBind();
                }
            }
        }
    }
}

protected void OnSave(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    for (int j = 0; j < gvCustomers.Columns.Count - 1; j++)
    {
        dt.Columns.Add(gvCustomers.Columns[j].HeaderText);
    }

    for (int i = 0; i < gvCustomers.Rows.Count; i++)
    {
        DataRow dr = dt.NewRow();
        for (int j = 0; j < gvCustomers.Columns.Count - 1; j++)
        {
            dr[gvCustomers.Columns[j].HeaderText] = gvCustomers.Rows[i].Cells[j].Text;
        }
        dt.Rows.Add(dr);
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Me.BindGrid()
    End If
End Sub
 
Private Sub BindGrid()
    Dim conn As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(conn)
        Using cmd As SqlCommand = New SqlCommand("SELECT CustomerId, Name, Country FROM Customers", con)
            Using sda As SqlDataAdapter = New SqlDataAdapter(cmd)
                Using dt As DataTable = New DataTable()
                    sda.Fill(dt)
                    gvCustomers.DataSource = dt
                    gvCustomers.DataBind()
                End Using
            End Using
        End Using
    End Using
End Sub
 
Protected Sub OnSave(ByVal sender As Object, ByVal e As EventArgs)
    Dim dt As DataTable = New DataTable()
    For j As Integer = 0 To gvCustomers.Columns.Count - 1 - 1
        dt.Columns.Add(gvCustomers.Columns(j).HeaderText)
    Next
    For i As Integer = 0 To gvCustomers.Rows.Count - 1
        Dim dr As DataRow = dt.NewRow()
        For j As Integer = 0 To gvCustomers.Columns.Count - 1 - 1
            dr(gvCustomers.Columns(j).HeaderText) = gvCustomers.Rows(i).Cells(j).Text
        Next
        dt.Rows.Add(dr)
    Next
End Sub

Screenshot

Hi Mohal, 

Please refer below sample to get DataTable when binding using SQLDataSource.

HTML

<asp:GridView runat="server" ID="gvCustomers" AutoGenerateColumns="false" DataSourceID="SqlDataSource1">
    <Columns>
        <asp:BoundField DataField="CustomerId" HeaderText="ID" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
        <asp:CommandField ButtonType="Button" ShowEditButton="true" HeaderText="Button" />
    </Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:constr %>"
    SelectCommand="SELECT CustomerId,Name,Country FROM Customers"></asp:SqlDataSource>
<br />
<asp:Button Text="Save" runat="server" OnClick="OnSave" />

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void OnSave(object sender, EventArgs e)
{
    DataView dv = (DataView)SqlDataSource1.Select(new DataSourceSelectArguments());
    DataTable dt = dv.ToTable();
}

 VB.Net

Protected Sub OnSave(ByVal sender As Object, ByVal e As EventArgs)
    Dim dv As DataView = CType(SqlDataSource1.[Select](New DataSourceSelectArguments()), DataView)
    Dim dt As DataTable = dv.ToTable()
End Sub

Screenshot