I think this will help you.
private void frm_Load(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection();
con.ConnectionString = "Your Connection String Here";
con.Open();
SqlDataAdapter da3 = new SqlDataAdapter("Select * from ALLTABLE where TableName='"+combobox1.Text+"'", con);
DataSet ds3 = new DataSet();
da3.Fill(ds3, "TableName");
CrystalReportName abc = new CrystalReportName();
abc.SetDataSource(ds3.Tables[0]);
crystalReportViewer1.ReportSource = abc;
crystalReportViewer1.Refresh();
con.Close();
}
any problem revert back