Insert data from a Repeater's textbox into a database

Question

I am using a Repeater that has a label and textbox. It generates the correct labels based on columns in a table (First Name, Last Name, Address, etc). The user is meant to type in their information into the corresponding textbox.

After this, I need a way to insert their data from the textbox into my database. However what I am unsure of is exactly how to insert each item into the correct column of the database. I am using Stored Procedures, so it would be something like:

sqlCmd.Parameters.Add("@FirstName", SqlDbType.Int).Value = firstName.Text;

Of course I cannot identify firstName.Text when the only textbox I have is a txtData repeated.

foreach (RepeaterItem rpItem in RepeaterForm.Items)
                    {
                        Label lblData = rpItem.FindControl("lblData") as Label;
                        TextBox txtData = rpItem.FindControl("txtData") as TextBox;

                        if (txtData != null)
                        {
                            sqlCmd.Connection = sqlConn;
                            sqlCmd.CommandType = CommandType.StoredProcedure;
                            sqlCmd.CommandText = "spInsFormFields";
                            sqlCmd.Parameters.Clear();

                          //Code here

                            sqlCmd.ExecuteNonQuery();
                        }
       }

A sample repeater form could look like this:

First Name: John

Last Name: Smith

Address: 123 Cherry Lane

And a sample of my database is like this:

Registrant table

FirstName, LastName, Address columns

Submit button should enter ONE row based on an EventId and FormId (which I collected earlier in my code)

EDIT:

Here is my Repeater code (as requested):

   <asp:Repeater ID="RepeaterForm" runat="server" OnItemCommand="RepeaterForm_ItemCommand">
   <ItemTemplate>
       <table>
            <tr>
                <td><asp:Label ID="lblData" runat="server" Text='<%# Eval("MyColumn") %>'></asp:Label></td>
                 <td><asp:TextBox ID="txtData" runat="server"></asp:TextBox>
                     <br></br></td>
       </tr>
       </table>
   </ItemTemplate>
        <FooterTemplate><asp:Button ID="BtnSubmit" runat="server" Text="Submit" OnClick="BtnSubmit_Click" /></FooterTemplate>
            </asp:Repeater>

Answer 1

Prepare your repeater like this:

 <form id="form1" runat="server">
    <div>
        <asp:Repeater ID="Repeater1" runat="server">
            <ItemTemplate>
                <input type="text"  name='<%#Eval("ColumnName") %>' />
            </ItemTemplate>
        </asp:Repeater>           
        <asp:Button ID="btnSave" runat="server" Text="Button" OnClick="btnSave_Click" />
    </div>
</form>

And by using this C# code you can get all the values dynamicly :

 public partial class WebForm1 : System.Web.UI.Page
{
    List<Column> Columns = new List<Column>();
    protected void Page_Init(object sender, EventArgs e)
    {
        Columns.Add(new Column { ColumnName = "ID" });
        Columns.Add(new Column { ColumnName = "Name" });
        Columns.Add(new Column { ColumnName = "Surname" });
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        Repeater1.DataSource = Columns;
        Repeater1.DataBind();
    }
    protected void btnSave_Click(object sender, EventArgs e)
    {
        Dictionary<string, string> Values = new Dictionary<string, string>();
        foreach (var item in Columns)
        {
            Values.Add(item.ColumnName, Request.Form[item.ColumnName]);
        }
    }
}
class Column
{
    public string ColumnName { get; set; }
}

Answer 2

Assume that txtFirstname , txtLastname , txtAddress are the names for respective controls in the repeater, then You can access them by using following code:

 foreach (RepeaterItem rpItem in RepeaterForm.Items)
            {
                TextBox tFirstname = rpItem.FindControl("txtFirstname") as TextBox;
                TextBox tLastname = rpItem.FindControl("txtLastname") as TextBox;
                TextBox tAddress = rpItem.FindControl("txtAddress") as TextBox;
                sqlCmd.Connection = sqlConn;
                sqlCmd.CommandType = CommandType.StoredProcedure;
                sqlCmd.CommandText = "spInsFormFields";
                sqlCmd.Parameters.Clear();
                if (tFirstname != null)
                    sqlCmd.Parameters.Add("@FirstName", SqlDbType.VarChar).Value = tFirstname.Text;
                if (tLastname != null)
                    sqlCmd.Parameters.Add("@Lastname", SqlDbType.VarChar).Value = tLastname.Text;
                if (tAddress != null)
                    sqlCmd.Parameters.Add("@Address", SqlDbType.VarChar).Value = tAddress.Text;
                sqlCmd.ExecuteNonQuery();
            }