No value given for one or more required parameters.

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ASP.NET

C#3.5

OleDb

protected void btnSubmit_Click1(object sender, EventArgs e)
{
OleDbConnection conn = new OleDbConnection(connection);
conn.Open();
string insertQuery = "update TrainingEvent_Table set EditTextCon = @EN";

string editText = RemoveHTML(Hidden1.Value);

OleDbCommand cmd = new OleDbCommand(insertQuery, conn);
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("@EN", editText.ToString());

cmd.ExecuteNonQuery();
}

public string RemoveHTML(string strHTML)
{
return Regex.Replace(strHTML, "<(.|\n)*?>", " ");
}