How can i filter data between to dates in visual studio 2008 report viewer in C#

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Here is my code plz help...
What sql query to use in my dataset to retrieve data between two dates in report viewer in vs 2008?????
i used two combo boxes..
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace lawise
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
SqlConnection cs = new SqlConnection("SERVER=ALI-PC\SQLEXPRESS; DATABASE=TIPU; Trusted_Connection = True");
SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM MAMA", cs);
DataTable dt = new DataTable();










da.Fill(dt);



for (int i = 0; i < dt.Rows.Count; i++)
{
comboBox1.Items.Add(dt.Rows["DATE"]); //////DATE is the column name which data loaded in combo boxes

}




da.Fill(dt);

for (int i = 0; i < dt.Rows.Count; i++)
{
comboBox2.Items.Add(dt.Rows["DATE"]);



}


}

private void btn1_Click(object sender, EventArgs e)
{
// TODO: This line of code loads data into the DataSet1.mama table. You can move, or remove it, as needed.
this.mamaTableAdapter.Fill(this.DataSet1.mama, Convert.ToDateTime(comboBox1.SelectedItem));
this.mamaTableAdapter.FillBy(this.DataSet1.mama, Convert.ToDateTime(comboBox2.SelectedItem));
this.reportViewer1.RefreshReport();
}
}
}

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