//Method to update data in database from our app
public bool Update(ContactClass c)
{
//create a default return type and set its default value to false
bool isSuccess = false;
SqlConnection conn = new SqlConnection(myconnstring);
try
{
//sql to update data in our database
string sql = "UPDATE Econtact SET FirstName=@FirstName, LastName=@LastName, ContactNo=@ContactNo, Address=@Address, Gender=@Gender WHERE ContactID=@ContactID";
//create sql commend
SqlCommand cmd = new SqlCommand(sql, conn);
//create parameters to add values
cmd.Parameters.AddWithValue("@FirstName", c.FirstName);
cmd.Parameters.AddWithValue("@LastName", c.LastName);
cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo);
cmd.Parameters.AddWithValue("@Address", c.Address);
cmd.Parameters.AddWithValue("@Gender", c.Gender);
cmd.Parameters.AddWithValue("@ContactID", c.ContactID);
//open database connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query rund successfylly then the value of rows will be grater than zero else values will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
// Insert Data into database
public bool Insert(ContactClass c)
{
//creating default return type and setting its values to false
bool isSuccess = false;
//step 1: connect Database
SqlConnection conn = new SqlConnection(myconnstring);
try
{
//Step 2: create a sql query to insert data
string sql = "INSERT INTO Econtact (FirstName, LastName, ContactNo, Address, Gender) VALUES (@FirstName, @LastName, @ContactNo, @Address, @Gender)";
//creating sql commend using sql and conn
SqlCommand cmd = new SqlCommand(sql, conn);
//Creat parameter to add data
cmd.Parameters.AddWithValue("@FirstName", c.FirstName);
cmd.Parameters.AddWithValue("@LastName", c.LastName);
cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo);
cmd.Parameters.AddWithValue("@Address", c.Address);
cmd.Parameters.AddWithValue("@Gender", c.Gender);
//open connection here
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query successfully then value of rows will be generate than zero else its value will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//method to delete data from database
public bool Delete(ContactClass c)
{
//create a default values and set its values to false
bool isSuccess = false;
//create sql connection
SqlConnection conn = new SqlConnection(myconnstring);
try
{
//sql to delete data
string sql = "DELETE FROM Econtact WHERE ContactID=@ContactID";
//create sql commend
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.AddWithValue("@ContactId", c.ContactID);
//open connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query rund successfylly then the value of rows will be grater than zero else values will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
//cloase connection
conn.Close();
}
return(isSuccess);
}
