Database Gateways in C#

[unixnag1]

Hi every one i made a database gateways to access multiple database with Oledb I have made Insert() Select() Delete()

but there is some problem in Update I am giving my Update code and their method of using
but i am not able to decide how user will give fields ant its value and type send foe updation

public void UpdateData(string DatabaseProvider, string DatabaseName, string TableName,Dictionary<string ,string> DC,string Condition)
{
string kk = null;
int i = 0;
foreach (KeyValuePair<string, string> jj in DC)
{
kk = kk + jj.Key + "=" + jj.Value ;
if (i == DC.Count- 1)
continue;
kk = kk + ",";
i++;
}

string ss = "Use " + DatabaseName + " update " + TableName + " set " + kk + Condition ;
if (ocon.State == ConnectionState.Closed)
{
ocon.Open();
}
ocmd = new OleDbCommand(ss, ocon);

try
{
int aa= ocmd.ExecuteNonQuery();
if (aa >0)
{
MessageBox.Show("Record Successfully Updated");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

}

How To use on button click

ConnectionManager cm = new ConnectionManager("SQL");
Dictionary<string,string > DC = new Dictionary<string,string>();
DC.Add("Price", "290");
DC.Add("High", "80000");
string condition = " where Symbol = 'CXD'";
cm.UpdateData("SQL", "info", "TBuyOrder", DC, condition);

but problem is that the dictionary i make it is string type if user input DateTime ,Double,or anyother type then How we Recognize in our function
any one can help me to solve this

Thanks